New class-AB operational transconductance amplifier for high-speed switched-capacitor circuits

Author

Wongnamkum, S. ; Thanachayanont, A.

Author_Institution

Dept. of Electron. Eng., King Mongkut´´s Inst. of Technol., Bangkok, Thailand

Volume

1

fYear

2004

fDate

26-29 Oct. 2004

Firstpage

531

Abstract

In this paper, a new differential class-AB operational transconductance amplifier for high-speed switched capacitor circuits is proposed. A new class-AB output circuit combines a shunt-feedback voltage follower circuit and the conventional folding output circuit to improve the slew rate and bandwidth. The OTA has been designed to operate with a supply voltage of 1.5 V,using a 0.35 μm CMOS technology. Simulation results for a load capacitance (C_L) of 3 pF show 300 V/μs slew rate and 330 MHz unity-gain frequency.

Keywords

CMOS analogue integrated circuits; UHF amplifiers; differential amplifiers; feedback amplifiers; operational amplifiers; switched current circuits; 0.35 micron; 1.5 V; 3 pF; 330 MHz; CMOS technology; OTA; bandwidth; class-AB operational transconductance amplifier; class-AB output circuit; differential amplifier; folding output circuit; high-speed switched-capacitor circuits; operational transconductance amplifier; shunt-feedback; slew rate; voltage follower circuit; Bandwidth; CMOS technology; Capacitance; Circuit simulation; Differential amplifiers; Frequency; Operational amplifiers; Switched capacitor circuits; Transconductance; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications and Information Technology, 2004. ISCIT 2004. IEEE International Symposium on

Print_ISBN

0-7803-8593-4

Type

conf

DOI

10.1109/ISCIT.2004.1412902

Filename

1412902