Title :
Low-voltage, rail-to-rail, Gm-enhanced pseudo-differential class-AB OTA
Author :
Thanachayanont, A. ; Chaloenlarp, W.
Author_Institution :
Dept. of Electron. Eng., King Mongkut´´s Inst. of Technol., Bangkok, Thailand
Abstract :
This paper presents a new class-AB pseudo-differential operational transconductance amplifier (OTA) for low-voltage and high-speed switched-capacitor circuits. The proposed OTA employs partial positive feedback to enhance the input transconductance, thus increasing the open-loop DC gain and the unity-gain frequency. A push-pull configuration is used to obtain rail-to-rail output voltage swing. Using a 0.35-μm digital 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 :
CMOS digital integrated circuits; circuit simulation; differential amplifiers; feedback amplifiers; high-speed integrated circuits; low-power electronics; operational amplifiers; switched capacitor networks; 0.35 micron; 1 V; 1 pF; 170 muA; 78 dB; circuit simulation; class AB pseudodifferential amplifier; digital CMOS process; feedback amplifiers; high speed switched capacitor circuits; low voltage switched capacitor circuits; operational transconductance amplifier; phase margin; push pull configuration; rail-rail output voltage; slew rate; CMOS process; Current supplies; Feedback; Frequency; Operational amplifiers; Power supplies; Rail to rail outputs; Switched capacitor circuits; Transconductance; Voltage;
Conference_Titel :
Circuits and Systems, 2004. MWSCAS '04. The 2004 47th Midwest Symposium on
Print_ISBN :
0-7803-8346-X
DOI :
10.1109/MWSCAS.2004.1353895
