Title :
A high-driving class-AB buffer amplifier with a new pseudo source follower
Author :
Lu, Chih-Wen ; Shen, Yen-Chih ; Sheu, Meng-Lieh
Author_Institution :
Department of Electrical Engineering, National, Chi Nan University, China
Abstract :
A high-driving class-AB buffer amplifier, which consists of a high-gain input stage and a pseudo source follower, is proposed. The pseudo source follower consists of two same types of differential pairs rather than two complementary error amplifiers. The high-driving capability is mainly provided by the folded amplifiers. An experimental prototype buffer amplifier implemented in a 0.35-μm CMOS technology demonstrates that the circuit dissipates an average static power consumption of only 660 μW at a power supply of 3.3 V, and exhibits the slew rates of 2.7 V/μs and 3.8 V/μs for the rising and falling edges, respectively, under a 300Ω/150 pF load. The second and third harmonic distortions (HD2 and HD3) are −67 dB and −65 dB, respectively, at 20 KHz under the same load.
Keywords :
CMOS technology; Circuits; Differential amplifiers; Energy consumption; Operational amplifiers; Power amplifiers; Power supplies; Prototypes; Variable structure systems; Voltage; buffer amplifier; class-AB; error amplifier; pseudo source follower;
Conference_Titel :
Very Large Scale Integration, 2007. VLSI - SoC 2007. IFIP International Conference on
Conference_Location :
Atlanta, GA, USA
Print_ISBN :
978-1-4244-1710-0
Electronic_ISBN :
978-1-4244-1710-0
DOI :
10.1109/VLSISOC.2007.4402481