Current-Mode Transceiver with Nonfeedback Clock Recovery Capability for Mobile Applications

Takefumi YOSHIKAWA  Tetsuhiro OGINO  Makoto NAGATA  

IEICE TRANSACTIONS on Electronics   Vol.E91-C   No.9   pp.1453-1462
Publication Date: 2008/09/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e91-c.9.1453
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Advanced Processors Based on Novel Concepts in Computation)
interface,  current mode,  low power,  low EMI noise,  

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The novel low-power and low-EMI-noise current-mode data transceiver described here, which has a multilevel current driver in the transmitter (TX) and a low-input impedance I-V converter in the receiver (RX). No-feedback clock recovery in the RX is achieved by using multi-levels of a driving current from TX to specify a single bit boundary. The I-V converter suppresses voltage swing in the transmission line and generates a multi-level voltage signal according to the level of the submilliampere driving current it receives. Measurement shows a small voltage swing ( 20 mV) with 150-µA and 450-µA drive currents at 625 Mbps. The simple clock-recovery system and low driving current allow the transceiver to operate with a single 1.5-V power supply and use only 3.5 mW at 625 Mbps.