Title :
Active-feedback frequency compensation for low-power multi-stage amplifiers
Author :
Lee, Hoi ; Mok, Philip K T
Author_Institution :
Dept. of Electr. & Electron. Eng., Hong Kong Univ. of Sci. & Technol., Clear Water Bay, China
Abstract :
This paper describes a novel active-feedback frequency compensation (AFFC) technique for low-power multi-stage amplifiers. With a high-speed active feedback block, the proposed compensation technique significantly improves both the frequency and the transient responses of the amplifier. Implemented by a standard 0.8μm CMOS process, a three-stage AFFC amplifier achieves 100dB gain, 4.5MHz gain-bandwidth product, 65° phase margin and 1.5V/μs slew rate with 0.4mW power consumption when driving a 100pF capacitive load.
Keywords :
CMOS analogue integrated circuits; compensation; feedback amplifiers; frequency response; high-speed integrated circuits; low-power electronics; transient response; 0.4 mW; 0.8 micron; 100 dB; 100 pF; CMOS; active-feedback frequency compensation; capacitive load; frequency response; gain-bandwidth product; high-speed active feedback block; low-power multi-stage amplifiers; phase margin; power consumption; slew rate; three-stage AFFC amplifier; transient response; Bandwidth; CMOS technology; Capacitors; Feedback; Frequency; Network topology; Operational amplifiers; Power amplifiers; Transconductance; Transient response;
Conference_Titel :
Custom Integrated Circuits Conference, 2002. Proceedings of the IEEE 2002
Print_ISBN :
0-7803-7250-6
DOI :
10.1109/CICC.2002.1012831
