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A current-mode common-mode feedback circuit (CMFB) with rail-to-rail operation
Author(s)
Suadet, Apirak
Date Issued
June 13, 2011
Type
Article
Abstract
This paper presents a current-mode commonmode feedback (CMFB) circuit with rail-to-rail operation. The CMFB is a stand-alone circuit, which can be connected to any low voltage transconductor without changing or upsetting the existing circuit. The proposed CMFB employs current mirrors, operating as common-mode detector and current amplifier to enhance the loop gain of the CMFB. The circuit employs positive feedback to enhance the output impedance and gain. The circuit has been designed using a 0.18 μm CMOS technology under 1 V supply and analyzed using HSPICE with BSIM3V3 device models. A pseudodifferential amplifier using two common sources and the proposed CMFB shows rail to rail output swing (± 0.7 V) with low common-mode gain (-36 dB) and power dissipation of 390 μW. Copyright © 2011 De Gruyter.
Citation
Frequenz, 65(1-2), 47-54, 2011