New fully differential HF CMOS op amp's with efficient common mode feedback

Chung-Yu Wu*, Ping Hsing Lu, Chien Hsiung Lee, Ming Kai Tsai

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations

Abstract

Conventional fully differential HF CMOS operational amplifiers (op amps) use an extra circuit to perform common-mode feedback (CMFB), which results in signal distortion and/or asymmetry as the signal swing increases. To solve this problem, two fully differential CMOS op amps that are based on merging two single-ended-output op amps are proposed and analyzed. Through the inherent differential-to-single-ended conversion circuitry, CMFB can be efficiently performed without extra circuits. The output signals are not distorted, and the HF performance is not degraded. Simulation and experimental results have confirmed the performance of the proposed new op amps.

Original languageEnglish
Pages (from-to)2076-2079
Number of pages4
JournalProceedings - IEEE International Symposium on Circuits and Systems
Volume3
DOIs
StatePublished - 1 Dec 1989
EventIEEE International Symposium on Circuits and Systems 1989, the 22nd ISCAS. Part 1 - Portland, OR, USA
Duration: 8 May 198911 May 1989

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