Low-voltage high-gain differential OTA for SC circuits

Author

Carvajal, R.G. ; Palomo, B. ; Torralba, Antonio ; Munoz, Felipe ; Ramirez-Angulo, Jaime

Author_Institution

Dept. de Ingenieria Electron., Seville Univ., Spain

Volume

39

Issue

16

fYear

2003

Firstpage

1159

Lastpage

1160

Abstract

A new differential operational transconductance amplifier (OTA) for SC circuits that operates with a supply voltage of less than two transistor threshold voltages is presented. Its simplicity relies on the use of a low-voltage regulated cascode circuit, which achieves very high output impedance under low-voltage restrictions. The OTA has been designed to operate with a supply voltage of V_DD=1.5 V, using a 0.6 μm CMOS technology with transistor threshold voltages of V_TN=0.75 V and V_TP=-0.85 V. Post-layout simulation results for a load capacitance (C_L) of 2 pF show a 75 MHz gain-bandwidth product and 100 dB DC gain with a quiescent power consumption of 750 μW.

Keywords

CMOS analogue integrated circuits; differential amplifiers; low-power electronics; operational amplifiers; switched capacitor networks; 0.6 micron; 1.5 V; 100 dB; 750 muW; CMOS technology; DC gain; capacitive load; differential operational transconductance amplifier; gain-bandwidth product; low-voltage regulated cascode circuit; output impedance; power consumption; switched capacitor circuit; transistor threshold voltage;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el:20030775

Filename

1226553