Harlow, UK C-MAC MicroTechnology has launched a range of low-jitter high-frequency TCVCXOs (temperature compensated, voltage controlled crystal oscillators) for use in TDM (time division multiplexing) switching systems for optical fibre backbone infrastructure. By using a high-frequency fundamental crystal together with C-MAC's Pluto temperature compensation technology, the new CFPT-9400 range is designed to eliminate reception 'slips' that compromise the effective bandwidth of SDH/SONET and Gigabit Ethernet fibre networks. The CFPT-9400 achieves excellent jitter performance of less than 3 ps rms 10 Hz to 80 MHz by avoiding the use of a phase locked loop in favour of a low-phase-noise HFF (high-frequency fundamental) crystal and harmonic multiplication. The HFF crystal is coupled through a SAW (surface acoustic wave) filter, suppressing any sub-harmonics of the operating frequency to typically less than "55 dBc. The CFPT-9400 is available in five output frequencies: 622.08000 MHz, 666.51436 MHz and 669.32658 MHz for SDH/SONET switches with or without FEC (forward error correction); and 644.53125 MHz and 693.48299 MHz for Gigabit Ethernet and emerging 10 Gbit Ethernet applications, with or without FEC. Frequency adjustment of up to ±60 ppm is available through external voltage control. Supply voltage is 3.3 V with a low current consumption of 65 mA typical, and output is 3.3 V PECL (LVPECL) compatible. The CFPT-9400 is packaged as an industry standard 14 x 9 mm SMD. It is designed for lead free soldering and compliant with all requirements of the RoHS regulations. C-MAC MicroTechnology , Harlow, UK. www.cmac.com.
David Patterson, known for his pioneering research that led to RAID, clusters and more, is part of a team at UC Berkeley that recently made its RISC-V processor architecture an open source hardware offering. We talk with Patterson and one of his colleagues behind the effort about the opportunities they see, what new kinds of designs they hope to enable and what it means for today’s commercial processor giants such as Intel, ARM and Imagination Technologies.