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CMOS continuous-time CMFB circuit with improved linearity

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3 Author(s)
Carrillo, J.M. ; Dept. of Electron. Eng., Univ. of Extremadura, Badajoz ; Ausín, J.L. ; Duque-Carrillo, J.F.

A continuous-time common-mode feedback (CMFB) network consisting of two unity-gain buffers and two passive resistors is introduced in this paper. According to the comparison with a previous implementation, the common-mode control structure presented shows an improved linearity performance as well as a higher immunity to device mismatches. The CMFB circuit has been included in the design of a fully differential voltage buffer, based on a fully differential difference amplifier. Simulated results, obtained in a 0.35-mum standard CMOS technology, are provided in order to show the performance of the proposed approach.

Published in:

Circuit Theory and Design, 2007. ECCTD 2007. 18th European Conference on

Date of Conference:

27-30 Aug. 2007