A Current-Mode Common-Mode Feedback Circuit (CMFB) with Rail-to-Rail Operation
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Apirak Suadet
Abstract
This paper presents a current-mode common-mode 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 1V supply and analyzed using HSPICE with BSIM3V3 device models. A pseudo-differential 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
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Articles in the same Issue
- Editorial
- Design of Compact Filter Based on Multilayered Left-Handed Transmission Line Using LTCC Technology
- A Metamaterial Inspired Compact Patch Antenna with Frequency Continuously Reconfigurable Performance for Cognitive Radio
- Nematic LCs Mixtures with High Birefringence in the Microwave Region
- A Fast-Locking Frequency Synthesizer for the Single-Chip CMOS UHF RFID Reader
- A Compact Analytical Design of Dual-Loop 18 GHz Frequency Synthesizer to Enhance Signal Reliability in Digital Millimeter Radio Link System
- Automatic Modulation Recognition of Mixed Multiple Source Signals
- A Current-Mode Common-Mode Feedback Circuit (CMFB) with Rail-to-Rail Operation
- Diversity and Multiplexing Tradeoff Analysis of Fractional Cooperative Networks
