Showing posts with label timing. Show all posts
Showing posts with label timing. Show all posts

Tuesday, July 24, 2018

Intel and SiTime collaborate on MEMS timing for 5G

SiTime, which specializes in MEMS timing solutions, and Intel agreed to collaborate on integrating timing solutions for Intel’s 5G multi-mode radio modems, with additional applicability to Intel LTE, millimeter-wave wireless, Wi-Fi, Bluetooth, and GNSS solutions.

SiTime said its MEMS timing technology helps meet the high-performance requirements of emerging 5G radio modem platforms, especially in the presence of stressors such as vibration, high temperature, and rapid thermal transients. Such stressors can disrupt the timing signal and result in network reliability issues, lower data throughput, and even connectivity drops.

“Our collaboration with SiTime on MEMS-based silicon timing solutions will help our customers build leading 5G platforms to best take advantage of the increased performance and capacity that the 5G NR standard brings,” said Dr. Cormac Conroy, corporate vice president and general manager of the Communication and Devices Group at Intel Corporation. “Intel’s modem technology and our collaboration with SiTime is helping to enable new mobile and consumer experiences, and enterprise and industrial use cases.”

“Intel is already building 5G’s future and has the scale to meet 5G’s scope,” said Rajesh Vashist, CEO at SiTime. “Our collaboration enables SiTime to align our MEMS timing solutions roadmap with Intel’s 5G platforms. Intel’s expertise in 5G modems, with SiTime’s game-changing timing technology, is a potent partnership for future growth and one that enables successful deployment of 5G. As SiTime continues to lead the world in MEMS timing, the opportunities between our companies are growing and this agreement sets us both on a path for continued success.”

Wednesday, March 7, 2018

ADVA's Oscilloquartz intros modular sync solution with 10G interfaces

ADVA Optical Networking's Oscilloquartz division introduced the first IEEE 1588 grandmaster clock device on the market to support PTP, NTP and SyncE over multiple 10Gbit/s Ethernet interfaces.

The new OSA 5430, which is designed to help network operators achieve the stringent phase and time synchronization requirements needed for LTE-TDD, LTE-A and 5G RAN networks, can be deployed in the core and at centralized aggregation locations.

It features fully redundant hardware -- in case one critical module fails, another instantly takes over. Built-in Syncjack assurance functionality ensures that operations teams are alerted to any issues before services are affected.

"Our OSA 5430 is a major milestone for network timing. With today's launch, we're answering the key challenges facing today's operators as they roll out next-generation technologies such as LTE-A, and addressing the urgent synchronization needs of finance and cable companies. This device provides a smooth transition from legacy sync and supports levels of integration never before seen in the industry. Interest in our OSA 5430 is extremely strong with major Tier 1 customers already secured," said Gil Biran, general manager, Oscilloquartz. "

Wednesday, February 7, 2018

SiTime reaches big milestone: 1 billion timing devices shipped

SiTime Corporation, which specializes in MEMS timing devices, announced a big milestone - the cumulative shipment of over 1 billion timing devices.

SiTime's MEMS timing devices are used in a wide range of applications such as mobile phones, tablets, fitness trackers, cameras, automobile, autonomous vehicles, rockets, earthquake detection systems, etc.

The company estimates the market for all timing devices is $6 billion, and SiTime supplies 90% of the MEMS timing components sold.

"SiTime is redefining timing technology, and we've only just begun our journey," said Rajesh Vashist, CEO of SiTime. "SiTime is uniquely focused on solving the most difficult timing problems for the electronics industry. That is why customers are using our timing products in self-driving cars, the Internet of Things, artificial intelligence systems, and 5G infrastructure. We believe that our timing components will be the device of choice for the next few decades."

Wednesday, November 29, 2017

Microsemi acquires Vectron's timing business

Microsemi has acquired the high-performance timing business of Vectron International, a Knowles company, for $130 million, excluding working capital adjustments.

Vectron specializes in frequency control, sensor and hybrid solutions using the very latest techniques in both bulk acoustic wave (BAW) and surface acoustic wave (SAW)-based designs from DC to microwave frequencies. Products include crystals and crystal oscillators; frequency translators; clock and data recovery products; SAW filters; SAW oscillators; crystal filters; SAW and BAW based sensors and components used in telecommunications, data communications, frequency synthesizers, timing, navigation, military, aerospace, medical and instrumentation systems.

Tuesday, April 18, 2017

IDT and Epson Introduce Timing Solution

Integrated Device Technology (IDT) and Seiko Epson, a leading supplier of quartz crystal technology, have introduced an ultra-high performance timing solution designed to address phase noise challenges in telecommunication and data centre applications.

For the solution, IDT's new 8V19N474 jitter attenuator and frequency synthesiser is coupled with Epson's VG-4513 voltage-controlled crystal oscillator (VCXO) to provide leading phase noise performance for demanding applications such as 40/100/400 Gigabit Ethernet timing.

The new 8V19N474 jitter attenuator and frequency synthesiser features RMS phase noise of 75 femtoseconds, with the ultra-low performance designed to provide system designers with the clocking requirement to transition from 28 Gbit/s to Ethernet interfaces utilising 56 Gbit/s PAM4 (TX) PHYs and other high-performance SerDes applications with sufficient timing margin.

IDT's 8V19N474 device can generate up to 12 reference clock signals and outputs multiple synchronised clocks, together with an output frequency range from 25 to 2500 MHz, including 125 and 156.25 MHz and LVDS and LVPECL outputs with adjustable amplitudes. The device targets Ethernet and OTN (OTU3, OTU4) in complex applications, as well as for driving ADC/DAC converters, cable TV head-end and DOCSIS 3.1 applications.

For wired communications, the IDT solution enables compliance with physical layer specifications of phase noise, bit error rate and signal-to-noise ratio without the need for external filtering. Additionally, the product's integrated low drop out regulator enables cost savings through enabling the use of an inexpensive DC/DC voltage supply.

Epson's VG-4513 VCXO device constitutes a proven component in the joint solution. Employing an HFF (high-frequency fundamental) crystal, the VG-4513 VCXO delivers very low close-in phase noise which, combined with the integrated VCO within IDT's 8V19N474, enables low phase noise at higher offset frequencies.


IDT's 8V19N474 product, which is available immediately, is supplied in an 8 x 8 mm 81-CABGA package; the Epson VG-4513 is also available now, provided in a 7 x 5 x 1.6 mm or a 5 x 3.2 x 1.3 mm ceramic package.

Monday, September 26, 2016

SiTime Unveils Next Gen Oscillators for Telecom and Networking Systems

SiTime unveiled a new family of Super-TCXOs (temperature compensated oscillators) and oscillators for telecommunications and networking equipment.


The new Elite Platform encompassing leverages the company's MEMS and analog technologies to deliver better performance, higher reliability and higher quality of service than conventional quartz solutions, even in the presence of environmental stressors.

In particular, SiTime's ELITE-Platform addresses environmental issues with potential to impact the performance of timing of network equipment in uncontrolled environments such as basements, curbsides, rooftops, and on poles. The company said precision timing components in these systems must now operate in the presence of high temperature, thermal shock, vibration and unpredictable airflow.

SiTime's Elite timing solutions are based on its unique DualMEMS architecture with TurboCompensation.

This architecture delivers exceptional dynamic performance with three key elements:

  • Robust, reliable, and proven TempFlat MEMS that eliminates activity dips and enables 30 times better vibration immunity than quartz
  • DualMEMS temperature sensing with 100% accurate thermal coupling that enables 40 times faster temperature tracking, which ensures the best performance under airflow and rapid temperature changes
  • Highly integrated mixed-signal circuits with on-chip regulators, a TDC (temperature to digital converter) and a low-noise PLL that deliver 5 times better immunity to power-supply noise, 30 uK temperature resolution that is 10 times better than quartz, and support for any frequency between 1 and 700 MHz

“New telecom infrastructure uses 4G/5G small cells and Synchronous Ethernet to increase network data capacity; the high-power components that are used in such systems will have high and constantly changing heat loads,” said Joe Madden, founder and principal analyst at Mobile Experts. “The dynamic performance of precision timing components during rapid temperature change will become a critical requirement in such equipment. MEMS technology inherently performs better in the presence of dynamic environmental conditions, and has become a very interesting alternative to quartz technology.”

The Elite Platform comprises four new product families with a wide range of frequencies and the following unique features. All Elite solutions offer 0.1 ppb/g vibration immunity and do not have activity dips or micro-jumps.

Stratum 3 precision Super-TCXOs for communications and cloud infrastructure equipment
  • ±100 ppb frequency stability over -40°C to +105°C, the widest operating temperature available with any TCXO
  • 1 to 5 ppb/°C frequency slope (ΔF/ΔT) at an extremely fast temperature ramp rate of 10°C/minute, a performance level that is unique among timing devices
  • 3e-11 Allan deviation (ADEV) at 10 second averaging time, 10 times better than typical quartz TCXOs
  • 0.2 ps/mV power supply noise rejection (PSNR), eliminates dedicated system LDO
  • Optional I2C/SPI frequency tuning, eliminates external DAC
 Super-TCXOs for GNSS, industrial and automotive applications
  • ±0.5 ppm frequency stability over -40°C to +105°C
Ultra-low jitter differential oscillators
  • 0.23 ps integrated RMS phase jitter (12 kHz to 20 MHz)
  • 0.1 ps integrated RMS phase jitter under Ethernet mask for 10G/40G/100G
  • ±10 ppm frequency stability over -40°C to +95°C, enabling better system reliability
High-temperature high-reliability differential VCXOs
  • Up to +95°C with excellent phase noise
  • Wide pull range from ±25 ppm to ±3600 ppm
  • 0.1% frequency tuning linearity under all conditions, 50 times better than quartz 
Engineering samples of the Elite-based ultra-low jitter differential oscillators and high-temperature VCXOs are available to qualified customers now. Samples of Elite-based Super-TCXOs are expected to be available in the first half of 2017. Pricing is available upon request.

SiTime is a wholly owned subsidiary of MegaChips Corporation (Tokyo Stock Exchange: 6875).

http://www.sitime.com

See video:  https://youtu.be/awhiNV1FQgQ

Wednesday, November 18, 2015

Microsemi Expands Clock Management Solutions

Microsemi introduced three new products in its portfolio of clock management solutions: ZL30244 and ZL30245 , two dual-channel any-to-any clock multiplier and frequency synthesizer integrated circuits (ICs), and ZL30255 , a dual-channel any-to-any clock multiplier and jitter attenuator. Target applications for the devices include access networks, storage area networks, data center infrastructure, enterprise infrastructure, and video broadcast equipment.

"Our three new clock management solutions build upon the success of Microsemi's single-channel versions, ZL30250/251 and ZL30253, further expanding product capabilities for our customers to reduce design complexity and lower bill of material costs," said Maamoun Seido, vice president and business unit manager of Microsemi's timing products. "Providing the second channel in these devices further simplifies and reduces the cost of designs. For clock trees that require multiple frequency families, the ZL30244, ZL30245 and ZL30255 provide lower chip count and lower cost solutions—all with exceptional jitter performance."

http://www.microsemi.com

Monday, August 3, 2015

ADVA Acquires Time4 Systems for Synchronization Technology

ADVA Optical Networking's Oscilloquartz division has acquiredTime4 Systems, which produces SFP-based pluggable clock devices that drive synchronization deeper into the access network. Financial terms were not disclosed.

Time4 Systems is a start-up based in Finland with 6 people in total.  Its network synchronization technology consists of SFP-based, pluggable clock devices that leverage global navigation satellite system (GNSS) receivers, telecom slave clocks (T-SCs), grandmasters (GMs) or boundary clocks (BCs). The SFP-based pluggable clock devices will become a part of the Oscilloquartz product portfolio and complement its existing synchronization offerings.

“Time4 Systems has a strategic understanding of the synchronization space. Their SFP-based pluggable sync devices are a clear example of this. They are a breakthrough technology for our industry,” said Brian Protiva, CEO, ADVA Optical Networking. “This technology enables Time4 Systems to address a number of key pain points for service providers that are seeking to deploy synchronization devices much deeper in the access network. This is why we acquired them. They are an ideal fit for our Oscilloquartz business and further strengthen a strong product portfolio. In fact, we already have a number of new business opportunities that we’re pursuing and we believe there’s a very clear market out there.”

http://www.advaoptical.com/


In 2014, ADVA Optical Networking SE acquired Oscilloquartz SA from Swatch Group. Financial terms were not disclosed.

Oscilloquartz specializes in network synchronization solutions, including high-quality quartz crystal oscillators.  The company, which was founded in 1949, offers technology for timing sources and timing distribution for legacy and next-generation packet networks. During its long history, Oscilloquartz has developed long-term relationships with hundreds of customers served by more than 80 distributors around the globe. The company is based in Neuchatel, Switzerland - the heart of Europe's traditional watchmaking region.

ADVA said the Oscilloquartz product portfolio complements its own Syncjack offering and enables the company to deliver a complete end-to-end solution and smooth migration for frequency and time synchronization to network operators, a large number of enterprise verticals and governmental institutions.

Wednesday, May 20, 2015

Microsemi Improves Capacity of Grandmaster Clock for LTE

Microsemi has doubled the Precision Time Protocol (PTP) client capacity of its TimeProvider 2700 PTP grandmaster (GM) clock that provides synchronization to LTE Networks. The TimeProvider 2700 now provides simultaneous hardware time stamping support of up to 128 PTP clients, resulting in a significant cost benefit using a single GM clock.

The higher capacity further facilitates ease of deployment as installed TimeProvider 2700s can be upgraded to greater client capacity without additional hardware. Microsemi said this significantly improves scalability and easily accommodates future network growth for PTP capacity expansion while minimizing future hardware investment or replacements. The capability to support up to 128 PTP clients also extends to Microsemi's TimeProvider 2300 Edge Boundary Clock.

"Microsemi is the world's standard for time and we are committed to continuing to develop timing solutions from the network core to the edge," said Barry Dropping, director, product management of Microsemi's Frequency & Timing division. "As new technologies and standards such as LTE Advanced and small cells are deployed, we are dedicated to providing our customers solutions that will leverage their existing network investment to meet their evolving needs."

http://www.microsemi.co

Wednesday, September 24, 2014

SiTime Raises $25 Million for MEMS Timing

SiTime Corporation, a MEMS analog semiconductor company based in Sunnyvale, California, has closed $25 million in new financing, which consisted of a combination of structured debt facility of $15 million provided by Capital IP Investment Partners and strategic equity investment from other investors.

SiTime specializes in silicon MEMS-based oscillators and clock generators that are a drop-in replacement for legacy quartz crystal products. The company has shipped over 200 million devices to date.

“SiTime has had a strong and enduring vision – to revolutionize the timing market with MEMS and analog technologies. Today, that vision is a reality, achieved through single-minded focus and rapid innovation. We have the best MEMS technology, the broadest product portfolio, the largest customer base, the highest shipped volumes, and are the preferred timing supplier for exciting new applications such as wearables and Internet of Things (IoT),” said Rajesh Vashist, CEO of SiTime “This financing, along with our leadership position, forms an unbeatable combination for future growth and innovation. We are pleased that CapIP recognizes SiTime’s market and revenue leadership and we value their industry expertise and ability to work with us to tailor the financing to our business objectives and long-term strategy.”

http://www.sitime.com/news/508-sitime-raises-25-million

In 2013,  SiTime introduced a family of 32 kHz MEMS oscillators designed to replace legacy quartz crystal resonators in mobile devices, such as smartphones, tablets, fitness monitoring and watch products, medical monitoring and wellness devices, etc.  

As with the company's other MEMS timing solutions, the new SiT15xx family of oscillators compare favorably to existing quartz-based devices in several ways; SiTime’s MEMS are 85% smaller, use 50% less power, and significantly exceed the reliability metrics of quartz by 15 times.

Thursday, September 11, 2014

Equinix Delivers High Precision Time from Perseus Telecom for Financial Firms

Equinix has begun offering "High Precision Time" by Perseus Telecom to financial firms colocated in its major data centers around the world.

The service can be used by companies in the financial industry to time-stampi trades with NIST (The National Institute of Standards and Technology) timing.  Equinix and Perseus have simplified this task by offering High Precision Time to Equinix customers in Chicago (CH1), Frankfurt (FR2), London (LD4), New York (NY4) and Tokyo (TY3).

Equinix said that by offering financial firms a standardized method of time-stamping trades globally, it enables them to more efficiently and cost effectively connect to the NIST time scale in Boulder, Colo. through the very data centers in which trades are occurring.

"With its network-rich data centers and savvy customer base ready to embrace new technology, Equinix was a natural partner in making High Precision Time globally available. We anticipate great demand for our solution and are looking at deepening our relationship with Equinix in Hong Kong, São Paulo, Singapore, Sydney and Toronto to proliferate our offering," stated Dr. Jock Percy, CEO, Perseus Telecom.

http://www.equinix.com
http://perseustelecom.com/

Thursday, July 17, 2014

CoreSite Offers High Precision Timing Service in its Data Center

CoreSite has begun offering "High Precision Time", a new certified timing service by Perseus Telecom, that is now available by direct interconnection from within CoreSite’s Northern Virginia Market. The service can be used to precisely synchronize time systems across multiple data centers and calibrate their perimeter to sub-nanoseconds of the National Institute of Standards and Technology (NIST) timescale.

Perseus specializes in high-speed global connectivity and managed services for the financial markets, iGaming, multi-media and eCommerce communities.

“High Precision Time provides financial market participants and other customers an accurate time synchronization solution,” said Dr. Jock Percy, Chief Executive at Perseus Telecom. “In addition to its certification and verification benefits, the service mitigates risk by offering the ability to stay ahead of any future time-stamping regulation. We are proud to bring High Precision Time to CoreSite’s Northern Virginia Market, given its proximity to financial markets and rich ecosystem of partners across all verticals.”

http://www.CoreSite.com
http://perseustelecom.com

Wednesday, June 4, 2014

SiTime Brings MEMS Timing to Wearables

SiTime introduced the smallest, lowest power 32 kHz TCXO (temperature compensated oscillator) designed for the emerging market of wearable electronics and Internet of Things (IoT).

The new, 32 kHz TCXO (temperature compensated oscillator) device, which leverages SiTime's MEMS technology, comes in a 1.5 x 0.8 mm chip scale package (CSP). It can perform various functions in a system included delivering reference for real time clock (RTC) function, sleep clock for connectivity (Bluetooth, Bluetooth Low Energy, Wi-Fi), and heartbeat clock for battery supervisory function.

Compared to a quartz TCXO, the SiT1552 MEMS TCXO is:

  • 20% of the size and is available in a 1.5 x 0.8mm CSP
  • 50% lower power, typically consuming less than 1 micro-amp
  • 45% thinner, with a height of 0.55 mm
  • 10 times faster startup, with a startup time of 0.3 milliseconds
  • 30 times higher shock resistance
  • 15 times higher reliability, at 500 million hours MTBF

“By using its game-changing TempFlat MEMS and analog technology, SiTime has once again shattered the limitations of quartz. The SiT1552 MEMS TCXO is 20% of the size and consumes 50% of the power of comparable quartz devices,” said Piyush Sevalia, executive vice president of marketing at SiTime. “Our MEMS enable new system architectures that offer higher performance, small size and longer battery life. With another industry first, we continue to revolutionize the timing industry with our breakthrough MEMS solutions.”

http://www.sitime.com/products/32-khz-oscillators/sit1552

Monday, May 19, 2014

Microsemi Intros Low-Noise, Chip Scale Atomic Clock

Microsemi Corporation introduced its Low Noise Chip Scale Atomic Clock (LN CSAC), which combines the best of oven-controlled crystal oscillator (OCXO) and standard CSAC technologies by employing an ultra-low power crystal oscillator within the control loop of the atomic clock to optimize Allan deviation and phase noise.

Microsemi said its innovations in processing, packaging and manufacturing makes possible portable atomic clocks with leading-edge performance and specifications, including for low noise, which is a critical parameter in many radar and communication applications for both military and industrial sectors.

"LN CSAC leverages the leading edge ultra-low power atomic clock technology developed by Microsemi to produce the only commercially available low power frequency reference and timing module unique within the industry," said Peter Cash, business area director of Microsemi's Space, Defense and Avionics (SDA) business. "This new device produces atomic clock accuracy and crystal oscillator signal purity that can operate using battery power to provide low power signal generation for a broad range of applications. These capabilities operate within the volume of typical ovenized crystal oscillators using a fraction of the power, with features common in sophisticated timing modules."

http://www.microsemi.com/time

Tuesday, March 11, 2014

ADVA Optical Networking Acquires Oscilloquartz SA

ADVA Optical Networking SE agreed to acquire Oscilloquartz SA from Swatch Group. Financial terms were not disclosed.

Oscilloquartz specializes in network synchronization solutions, including high-quality quartz crystal oscillators.  The company, which was founded in 1949, offers technology for timing sources and timing distribution for legacy and next-generation packet networks. During its long history, Oscilloquartz has developed long-term relationships with hundreds of customers served by more than 80 distributors around the globe. The company is based in Neuchatel, Switzerland - the heart of Europe's traditional watchmaking region.

ADVA said the Oscilloquartz product portfolio complements its own Syncjack offering and enables the company to deliver a complete end-to-end solution and smooth migration for frequency and time synchronization to network operators, a large number of enterprise verticals and governmental institutions.

“Synchronization technology is a critical element to the development of our networks; a critical element to the development of our business,” said Brian Protiva, CEO and co-founder, ADVA Optical Networking. “That's why our acquisition of Oscilloquartz is so important. The technology and intelligence we're buying here completes our synchronization delivery and assurance portfolio, it completes our Syncjack solution."

http://www.advaoptical.com

Tuesday, November 26, 2013

Microsemi Completes Symmetricom Acquisition - Precision Timing

Microsemi completed its previously announced acquisition of Symmetricom for approximately $230 million, or $7.18 per share, representing a premium of 49 percent based on the average closing price of Symmetricom's shares of common stock during the 90 trading days ended Oct. 18, 2013.

Microsemi said the deal enables it to offer the industry's largest and most complete timing product offering spanning from the core of the network to the edge and including the source, synchronization and distribution of end-to-end timing solutions.

Symmetricom specialized in highly precise timekeeping technologies for data, voice, mobile and video networks and services. It provides timekeeping in GPS satellites, national time references, and national power grids as well as in critical military and civilian networks. The company is based in San Jose, California.

Microsemi's other product lines include high-performance and radiation-hardened analog mixed-signal integrated circuits, FPGAs, SoCs and ASICs; power management products; timing and voice processing devices; RF solutions; discrete components; security technologies and scalable anti-tamper products; Power-over-Ethernet ICs and midspans; as well as custom design capabilities and services. The company is based in Aliso Viejo, California.

"We look forward to integrating the talented Symmetricom team and leveraging our product and technology synergies to develop solutions that contribute to our customers' success," said James J. Peterson, chairman of the board and CEO of Microsemi. "We are eager to drive the business forward for our stakeholders as we continue to execute Microsemi's growth strategy."

http://www.microsemi.com/

Monday, October 21, 2013

Microsemi to Acquire Symmetricom for its Precise Timing Solutions

Microsemi agreed to acquire Symmetricom for approximately $230 million, or $7.18 per share, representing a premium of 49 percent based on the average closing price of Symmetricom's shares of common stock during the 90 trading days ended Oct. 18, 2013.

Symmetricom specializes in highly precise timekeeping technologies for data, voice, mobile and video networks and services. It provides timekeeping in GPS satellites, national time references, and national power grids as well as in critical military and civilian networks. The company is based in San Jose, California.

Microsemi said expects significant synergies from this immediately accretive transaction. Based on current assumptions, Microsemi expects the acquisition to be $0.22 to $0.25 accretive in its first full calendar year ending December 2014.

Microsemi's current product lines include high-performance and radiation-hardened analog mixed-signal integrated circuits, FPGAs, SoCs and ASICs; power management products; timing and voice processing devices; RF solutions; discrete components; security technologies and scalable anti-tamper products; Power-over-Ethernet ICs and midspans; as well as custom design capabilities and services. The company is based in Aliso Viejo, California.

"The acquisition of Symmetricom will create the largest and most complete timing portfolio in the industry today," stated James J. Peterson, Microsemi president and chief executive officer. "From source to synchronization to distribution, Microsemi will offer an end to end timing solution for an expanded range of markets, driving increased dollar content opportunity and revenue growth."
"The acquisition of Symmetricom by Microsemi will create a powerful combination," said Elizabeth Fetter, Symmetricom's chief executive officer. "I believe Microsemi is the ideal company to leverage Symmetricom's technology and capabilities further into the communications market along with the scale to accelerate the adoption of the company's innovative new chip scale atomic clock (CSAC) technology into broader markets."

http://www.microsemi.com/
http://www.symmetricom.com/

Wednesday, September 5, 2012

Ericsson Invests in Sand 9 for MEMS Timing Devices


Sand 9, a start-up based in Cambridge, Mass., announced that Ericsson has invested $3 million in the company.

Sand 9's MEMS timing-device uses piezoelectric actuation to achieve stringent phase noise and short-term stability requirements for wireless and wired applications.

http://www.sand9.com


  • In June, Sand 9 raised a total of $23 million in its Series C financing.  This funding round was led by Intel Capital with significant participation from Vulcan Capital. Intel Capital and Vulcan Capital join existing investors Commonwealth Capital Ventures, Flybridge Capital Partners, General Catalyst Partners, Khosla Ventures and CSR.

Tuesday, September 4, 2012

Harnessing Next-Generation Network Timing and LTE

By Martin Nuss, Ph.D., Vice President, Technology and Strategy and Chief Technology Officer, Vitesse

LTE has been rapidly moving towards a packet based backhaul network, while still trying to cope with a dated and inadequate timing model based on TDM.  Timing is necessary for both 3G and 4G deployments. Today, timing is typically delivered by either a SONET/SDH-based T1/E1 line or from GPS satellites.  SONET/SDH is not only expensive, but also inadequate for next-generation wireless networks, since it can only deliver frequency synchronization, but not the time-of-day (ToD) synchronization that is mandatory for TD-LTE and LTE-Advanced (LTE-A) – the “true 4G.”

In many cases, operators use GPS satellites, rather than T1/E1, to provide both phase and frequency synchronization. However, GPS is prone to jamming and faces reception issues for small cell deployments inside a building or in urban corridors, due to the lack of direct GPS satellite visibility. With the advent of LTE-A, with support for multi-band operation, wide use of Multiple-Input/Multiple-Output (MIMO) antenna systems, and increased use of micro and picocells to expand capacity and coverage, the GPS issues become intractable for many operators. For example, many picocell and microcell base stations will be deployed in locations such as lampposts and at the sides of buildings. They are positioned in urban corridors where tall buildings likely will block access to multiple GPS satellites, which would preclude meeting the LTE-A timing specifications.  The optimal solution is to deliver timing through the network, but this has challenges.

Synchronous Ethernet (SyncE) offers a direct replacement for TDM-derived timing as the backhaul network converts to all-Ethernet protocols. However SyncE, like T1/E1-based TDM timing, can support only frequency synchronization, not the newly required time-of-day synchronization. The good news is that the IEEE and the ITU have worked on standardizing a packet-based timing for both frequency and ToD delivery in telecom networks – IEEE 1588v2 Precision Timing Protocol, or PTP.  IEEE 1588v2 or “1588v2” for short has now gained widespread acceptance as the de facto packet based timing protocol for mobile operators.  Market analysts predict that by 2015, Synchronous Ethernet could be used in 30 percent of timing solutions, greater than T1/E1 or GPS deployments. However, in the same timeframe, 1588v2 is expected to grow to over 50 percent of all deployments.

IEEE1588v2: Better Timing Through Time Stamp Collection

Targeted at packet-based backhaul networks, IEEE 1588v2 carries time of day information (also known as timestamps) directly within the data packets.  The packets carrying the timestamps flow along with the rest of the data traffic in the network from networking equipment that generates the timestamps (also known as primary reference clock) all the way to base station equipment where these timestamps are used to recover the original time using IEEE 1588v2. The difference between primary reference clock and recovered clock (i.e. the synchronization error) needs to be within the accuracy requirement shown in Figure 2.  This synchronization error is cumulative across every node in the network in the path between the network node generating the master clock and the base station. Meanwhile, the challenge of migration from FD-LTE to TD-LTE/LTE-A, makes the synchronization error limits even more challenging.

Providing an IEEE 1558v2 implementation with timing errors below the network requirements is paramount to a successful deployment of this technology.   The primary source of the IEEE 1588v2 synchronization error comes from the packet delay variations (PDV) that are inherent in any packet network. The key to meeting the accuracy requirements is an IEEE 1588v2 compliant solution that can compensate for the PDV in the most cost effective way.  The IEEE 1588v2 standard specifies multiple clock types.  Besides ordinary clocks at the beginning and the end of the timing chain, boundary clocks (BC) and transparent clocks (TC) are defined for network elements in between.

In general, a BC node is more complex and costly to implement than a TC node. A node that implements BC regenerates the timing based on the timestamps that it receives and a node that implements TC simply forwards the incoming timestamps after correcting for any error it may introduce. So a TC node requires only accurate time stamping and time stamp correction mechanism, while a BC node requires timestamping, time stamp correction, a reliable PDV filtering algorithm, and a IEEE 1588v2-aware timing complex that can be synchronized to the network.

The only way to meet LTE-A accuracy requirements for both BC and TC is with a well-architected time stamping architecture.  As shown by silicon vendors, such time stamping and correction mechanism can be incorporated into port-level PHY silicon that can be universally used by the equipment vendors in the datapath without any other changes to the system.  In fact, such a port-based PHY solution is completely sufficient to implement a highly accurate TC node, while any BC node also greatly benefits from port-level accurate time stamping.  Under the bottom line, the most cost effective way to upgrading the network for LTE-A and future small-cell networks is to deploy distributed TC’s everywhere, augmented with BC’s only where necessary to segment timing domains. The use of TC’s can increase timing accuracy to the nanosecond range, as shown by Vitesse in a recent submission to the ITU-T standards committee.  Silicon advances available today will insure that such solutions will carry only a nominal premium over non-IEEE 1588v2 aware systems designed for 3G networks today.

Careful TC planning can allow for picocell synchronization in an outdoor environment, and synchronization down to the femtocell in large indoor multi-floor installations.  In the former case, TCs can even be carried over microwave and millimeter-wave links and still meeting TD-LTE and LTE-A specifications while eliminating the requirement for GPS signals or fiber links at the small cell.  In an indoor environment, the access network itself can generate IEEE1588v2 timing, or a GPS antenna on the roof of the building can generate time packets for synchronization of services inside the building, using IEEE 1588v2 to distribute timing within the building.

Upgrading Via a Painless Path

IEEE 1588v2 promises a simple, low-cost option for packet network timing upgrades and an ideal alternative and backup to GPS for TD-LTE and LTE-A networks. In many instances, full IEEE 1588v2 awareness is only needed right at the base station or cell site where timing needs to be provided to the cell.  Within the many hops in the network along the way, Transparent Clocks provide the most cost effective way to upgrade the network to LTE and LTE-Advanced simply by replacing port-level PHYs with new devices such as the ones from Vitesse, that can implement a nanosecond-accurate and highly stable time-of-day forwarding architecture, while fully compensating for transit time and PDV.


About the Author

Martin Nuss joined Vitesse in November 2007 as Vice President, Technology and Strategy and Chief Technical Officer. With more than 20 years of technical and management experience, Mr. Nuss was most recently, chief technology officer of Ciena's Optical Ethernet group where he led the successful integration of the products and technology acquired from Internet Photonics. Prior to Ciena's acquisition of the company, he was founder and CTO of Internet Photonics. He also served 15 years at Bell Labs in various technical and management roles including director of the Optical Data Networks Research Department, where he was responsible for research on Lucent's 10 Gigabit Multimode Fiber and innovations in the 10 GbE Metro Networking space. He is a Fellow of the Optical Society of America and a member of IEEE. Mr. Nuss holds a doctorate in applied physics from the Technical University in Munich, Germany.

Sunday, August 19, 2012

Discera Ships Sicon MEMS Oscillator

Discera announced the production availability of its DSC3001 PureSilicon oscillator for mobile, video, and audio applications. The device is available in frequencies up to 150 MHz and temperature ranges up to 105 degrees Celsius with shock resistance up to 30,000 G.


Discera said its DSC3001 series of oscillators is available in both low power and high precision configurations that consume as little as 3mA of power and deliver higher frequency stability over wider temperature ranges for better performance than other crystal or silicon based products.

Key features include:

  • 1.6 mm x 1.2 mm x 0.5 mm footprint

  • Output frequency support from 1 to 150 MHz

  • Frequency stabilities of 10, 25, 50 ppm across temperature and voltage

  • Operating temperature range up to 105 degrees Celsius

  • Supply current as low as 15uA standby, 3mA active from 1.7 to 3.6V

  • Fast startup time of 1.0 millisecond

  • MIL-STD883 shock and vibration tolerant to 30,000 G

  • AEC-Q100 qualification for automobile applications

  • Lead-free and RoHS compliant
http://www.discera.com

See also