Jesus Guinea

A 10-Gb/s CMU/CDR chip-set in SiGe BiCMOS commercial technology with multistandard capability

A 10-Gb/s CMU/CDR chip-set presenting multistandard compliance with SDH/SONET and 10-GbE specifications has been fabricated in a commercial SiGe BiCMOS technology. The clock multiplier unit (CMU) features dual reference clock frequency, and the phase tracking loop uses a charge pump with low common-mode current to minimize frequency ripple; the output jitter is below 80 mUIpp. The clock and data recovery (CDR) features a 20-mV-sensitivity limiting amplifier, a 2-DFF-based decision circuit to maximize clock phase margin (CPM) and a dual-loop phase-locked loop (PLL) architecture with external reference clock. A novel phase detector topology featuring a transition density factor compensation loop has been exploited to minimize jitter. Power consumption is 480 mW and 780 mW, respectively, for the two ICs, from 3.3-V and 2.5-V power supplies

A 10 Gb/s CDR in SiGe BiCMOS commercial technology with multistandard capability

A 10 Gb/s CDR in SiGe BiCMOS technology featuring multistandard compliance with SDH/SONET and 10 Gb Ethernet specs and generated jitter below 65 mUlpp is presented. The CDR features a 20 mV-sensitivity limiting amplifier, a 2-DFF-based decision circuit to maximize CPM and a dual loop PLL architecture with external reference clock and a novel PD topology. Power consumption is below 780 mW from 2.5 and 3.3 V supplies.

An instrumentation 128dB-SNR 750μA SDM

One of the largest SDM DR is achieved at low power consumption by means of several SC design solutions, like multi-bit topology, large OSR, improved switching scheme, chopper & NMOS input pair, accurate opamp design. In a 3.3V 0.35μm CMOS technology, 128dB-DR in a 250Hz bandwidth is achieved with 0.75mA current from a single 2.4mW supply for high-performance instrumentation application.

Vlsi solutions for voice and channel coders

In the last few years we have seen a relevant transformation of the telephone network, with an extensive digitalization of the voice transmission and switching able now to reach the subscriber. In the meanwhile various techniques have been implemented to exploit data transmission in an environment designed for voice only. This paper will review this important transformation and its future perspective from the point of view of theic industry by considering several analog/digital basic realization inpcm, analog modem,isdn and radio-communication fields.RésuméLes dernières années ont été caractérisées par une transformation significative des réseaux téléphoniques, avec numérisation de plus en plus grande de la transmission et de la commutation jusqu’ à ľabonné lui-même. En même temps, des techniques variées ont été mises en place pour exploiter la transmission de données dans un environnement jusqu’ici conçu pour la voix. Ľarticle prend en compte cette transformation et ses conséquences futures dans le domaine de ľIndustrie microélectronique, en s’appuyant sur plusieurs réalisations concrètes de circuits analogiques et numériques dans le domaine dumic (codec à capacités commutées, joncteur ďabonné à processeur de signal), des modems analogiques, durnis (numérisation de la ligne ďabonné) et des radiocommunications avec les mobiles (traitement du signal vocal en bande de base).