A low-voltage, highly linear voltage-controlled transconductor

Author

Fayed, Ayman A. ; Ismail, Mohammed

Author_Institution

Dept. of Electr. Eng., Ohio State Univ., Columbus, OH, USA

Volume

52

Issue

12

fYear

2005

Firstpage

831

Lastpage

835

Abstract

A low-voltage fully differential, voltage-controlled transconductor is described. The proposed transconductor achieves a wide input/control voltage range, with a highly linear transconductance factor and truly fully differential output currents. The transconductor is used to implement a G_m-C adaptive forward equalizer (FE) for a 125 Mbps wire line transceiver using digital core transistors with channel length of no more than double the feature size in a typical digital CMOS 180-nm process and supply voltage as low as 1.6 V. The adaptive FE enables IEEE 1394b transceivers to operate over UTP-5 cables for up to 100 m in length. The transconductor stage occupies 1945 μm² and consumes an average power of 418 μw at 125 Mbps and 1.8-V supply.

Keywords

adaptive equalisers; transceivers; twisted pair cables; 1.8 V; 125 Mbit/s; 180 nm; 418 muW; CMOS analog integrated circuits; IEEE 1394b transceivers; UTP-5 cable; digital CMOS process; digital core transistors; forward equalizer; fully differential output currents; fully differential transconductor; voltage-controlled transconductor; wire line transceiver; CMOS process; Cables; Equalizers; Iron; Low voltage; Transceivers; Transconductance; Transconductors; Voltage control; Wire; CMOS analog integrated circuits; equalizers; filters; transconductors;

fLanguage

English

Journal_Title

Circuits and Systems II: Express Briefs, IEEE Transactions on

Publisher

ieee

ISSN

1549-7747

Type

jour

DOI

10.1109/TCSII.2005.853511

Filename

1556801