Linearized CMOS OTA using active-error feedforward technique

Author

Szczepanski, S. ; Koziel, S. ; Sánchez-Sinencio, E.

Author_Institution

Fac. of Electron., Telecommun. & Inf., Gdansk Univ. of Technol., Poland

Volume

1

fYear

2004

fDate

23-26 May 2004

Abstract

Highly linear operational transconductor amplifier (OTA) is developed, using CMOS differential pair transconductors in an active-error feedforward linearization configuration. As a result, improved linearity of the differential-input two-output OTA is obtained. SPICE simulations show that for the circuit working with a ±1.25 V power supply, total harmonic distortion (THD) for f = 1 MHz at 0.4V_pp (0.8_pp) is less than -72 dB (-60 dB) in comparison to -35 dB (-20 dB) without linearization. Moreover, the input voltage range of linear operation is increased by more than 300%. Power consumption of the overall circuit is 0.94 mW.

Keywords

CMOS integrated circuits; feedforward; harmonic distortion; linearisation techniques; operational amplifiers; 0.94 mW; CMOS differential pair transconductors; SPICE simulation; active-error feedforward linearization; differential-input two-output OTA; input voltage range; linearized CMOS OTA; operational transconductor amplifier; power consumption; total harmonic distortion; Circuit simulation; Differential amplifiers; Energy consumption; Linearity; Operational amplifiers; Power supplies; SPICE; Total harmonic distortion; Transconductors; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on

Print_ISBN

0-7803-8251-X

Type

conf

DOI

10.1109/ISCAS.2004.1328253

Filename

1328253