Title :
AC boosting compensation scheme for low-power multistage amplifiers
Author :
Peng, Xiaohong ; Sansen, Willy
Author_Institution :
Dept. of Electr. Eng., Katholieke Univ. Leuven, Heverlee, Belgium
Abstract :
A new power-efficient frequency compensation scheme is proposed, called the AC Boosting Compensation (ACBC) scheme. An ac path is added to the internal stage of the conventional multistage amplifier, which improves significantly the performance such as the gain-bandwidth product and the slew rate without increasing the total power consumption. Analysis shows that the stability can be perfectly ensured. Two three-stage amplifiers have been implemented with and without a feed-forward stage, and fabricated in a 0.35-μm CMOS process. The ACBC amplifiers driving a 500-pF capacitance achieved 1.9-MHz gain-bandwidth product (GBW) dissipating only 0.3-mW power with a 2-V supply. An amplifier based on conventional nested Miller compensation (NMC) could only achieve 0.11-MHz GBW with the same load and power conditions, which shows an improvement of a factor of 17 in GBW.
Keywords :
CMOS integrated circuits; amplifiers; circuit stability; compensation; integrated circuit design; low-power electronics; 0.3 mW; 0.35 micron; 2 V; 500 pF; AC boosting compensation scheme; ACBC amplifiers; CMOS process; ac path; feed-forward stage; frequency compensation scheme; gain-bandwidth product; low-power multistage amplifiers; nested Miller compensation; slew rate; three-stage amplifiers; Boosting; Capacitors; Energy consumption; Feedforward systems; Frequency; Parasitic capacitance; Poles and zeros; Power amplifiers; Stability analysis; Topology; AC boosting; amplifier; amplifiers; compensation; low power; multistage;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2004.835811
