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.
|Number of pages||4|
|Journal||Proceedings - IEEE International Symposium on Circuits and Systems|
|State||Published - 1 Dec 1989|
|Event||IEEE International Symposium on Circuits and Systems 1989, the 22nd ISCAS. Part 1 - Portland, OR, USA|
Duration: 8 May 1989 → 11 May 1989