Title :
A general description of common-mode feedback in fully-differential amplifiers
Author :
VanPeteghem, P.M. ; Duque-Carrillo, J.F.
Author_Institution :
Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA
Abstract :
Fully-differential amplifiers and their common-mode feedback (CMFB) loops are described, and the impact of CMFB loop mismatching on common mode rejection ratio (CMRR) noise and distortion is discussed. A set of gain parameters which are suitable for predicting the actual performance of such a balanced amplifier is defined. The presented formalism takes mismatching and nonlinearity in the CMFB loop into account. The gain parameters can easily be calculated or simulated for different circuit configurations. It is concluded that the common-mode sense circuits can have a major impact on the accuracy of the differential mode signal processing
Keywords :
differential amplifiers; feedback; network analysis; CMFB loop mismatching; balanced amplifier; common mode rejection ratio; common-mode feedback; common-mode sense circuits; differential mode signal processing; distortion; fully-differential amplifiers; gain parameters; Analog integrated circuits; Delta modulation; Feedback loop; Instruments; Integrated circuit noise; Low voltage; Operational amplifiers; Output feedback; Signal processing; Signal to noise ratio;
Conference_Titel :
Circuits and Systems, 1990., IEEE International Symposium on
Conference_Location :
New Orleans, LA
DOI :
10.1109/ISCAS.1990.112716
