Title :
Low-voltage Gm-enhanced class-AB pseudodifferential OTA for switched-capacitor circuits
Author :
Chaloenlarp, W. ; Thanachayanont, A.
Author_Institution :
Fac. of Eng., King Mongkut´´s Inst. of Technol., Bangkok, Thailand
Abstract :
A new low-voltage, rail-to-rail output swing, class-AB pseudodifferential operational transconductance amplifier (OTA) for high-speed switched-capacitor applications is proposed. Positive feedback is employed to enhance the input transconductance, which increases the open-loop DC gain and the unity-gain frequency of the OTA. Using a 0.35-μm CMOS process, the proposed OTA can obtain 78-dB DC gain, 72.5° phase margin, 100-V/μS slew rate with 1-pF load capacitor, while draining 170-μA quiescent supply current from a single 1-V power supply voltage.
Keywords :
feedback; operational amplifiers; switched capacitor networks; 1 V; 170 muA; CMOS process; OTA; capacitor; class-AB pseudodifferential amplifier; operational transconductance amplifier; positive feedback; rail-to-rail output swing; slew rate; switched-capacitor circuit; CMOS process; Capacitors; Current supplies; Feedback; Frequency; Operational amplifiers; Power supplies; Rail to rail amplifiers; Rail to rail outputs; Transconductance;
Conference_Titel :
TENCON 2004. 2004 IEEE Region 10 Conference
Print_ISBN :
0-7803-8560-8
DOI :
10.1109/TENCON.2004.1414912
