Title :
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
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 (CL) 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;
Conference_Titel :
Communications and Information Technology, 2004. ISCIT 2004. IEEE International Symposium on
Print_ISBN :
0-7803-8593-4
DOI :
10.1109/ISCIT.2004.1412902
