Linearization Technique for Source-Degenerated CMOS Differential Transconductors

Author

Monsurrò, Pietro ; Pennisi, Salvatore ; Scotti, Giuseppe ; Trifiletti, Alessandro

Author_Institution

Univ. di Roma La Sapienza, Rome

Volume

54

Issue

10

fYear

2007

Firstpage

848

Lastpage

852

Abstract

A supplementary linearization technique for CMOS differential pairs with resistive source degeneration is proposed. The approach exploits an auxiliary (degenerated) differential pair to drive the bulk terminals of the main pair. Transistor-level simulations on a design using a 0.25-mum process and powered with 2.5 V and 1 mA, show that total harmonic distortion (THD) in the voltage-to-current conversion is decreased by 10 dB (for an input differential signal with a peak amplitude of 0.5 V and for frequencies up to 100 MHz) compared to the traditional source-degenerated transconductor. This THD improvement is achieved with a negligible increase in power consumption.

Keywords

CMOS analogue integrated circuits; continuous time filters; harmonic distortion; linearisation techniques; CMOS differential pairs; CMOS differential transconductors; current 1 mA; linearization techniques; power consumption; resistive source degeneration; size 0.25 mum; total harmonic distortion; voltage 2.5 V; voltage 500 mV; CMOS technology; Circuits; Equations; Filters; Linearity; Linearization techniques; Resistors; Transconductance; Transconductors; Voltage; Analog CMOS circuits; linearization technique; 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.2007.906203

Filename

4349232