Impedance Adapting Compensation for Low-Power Multistage Amplifiers

Author

Peng, Xiaohong ; Sansen, Willy ; Hou, Ligang ; Wang, Jinhui ; Wu, Wuchen

Author_Institution

Electron. Eng. Dept., Beijing Univ. of Technol., Beijing, China

Volume

46

Issue

2

fYear

2011

Firstpage

445

Lastpage

451

Abstract

A power-efficient frequency compensation topology, Impedance Adapting Compensation (IAC), is presented in this paper. This IAC topology has, on one hand, a normal Miller capacitor, which is still needed to provide an internal negative feedback loop, and on the other hand, a serial RC impedance as a load to the intermediate stage, improving performance parameters such as stability, gain-bandwidth product and power dissipation. A three-stage IAC amplifier was implemented and fabricated in a 0.35 μm CMOS technology. Experiment results show that the implemented IAC amplifier, driving a 150 pF load capacitance, achieved a gain-bandwidth product (GBW) of 4.4 MHz while dissipating only 30 μW power with a 1.5 V supply.

Keywords

amplifiers; capacitors; low-power electronics; CMOS technology; IAC amplifier; IAC topology; Miller capacitor; capacitance 150 pF; frequency 4.4 MHz; impedance adapting compensation; low-power multistage amplifier; power 30 muW; power-efficient frequency compensation topology; serial RC impedance; size 0.35 micron; voltage 1.5 V; Multistage; amplifier; amplifiers; compensation; impedance adapting; low power; low voltage;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/JSSC.2010.2090088

Filename

5648365