A rail-to-rail amplifier input stage with +/- 0.35%gm fluctuation
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abstract
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A new scheme for achieving rail-to-rail input to an amplifier is introduced. Constant gm is obtained by using tunable level shifters and a single differential pair. Feedback circuitry controls the level shifters in a manner that fixes the common-mode input of the differential pair, resulting in consistent and stable operation for rail-to-rail inputs. As the new technique avoids using complimentary input differential pairs, this method overcomes problems such as common-mode rejection ratio and gain-bandwidth product degradation that exist in many other designs. The circuit was fabricated in 0.5-μm process. The resulting differential pair had a constant transconductance that varied by only ±0.35% for rail-to-rail input common-mode levels. The input common-mode range extended well past the supply levels of ± 1.5 V, resulting in only ± 1% fluctuation in gm for input common modes from -2 to 2 V. © 2005 IEEE.
published proceedings
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IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
author list (cited authors)
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Fischer, T. W., Karsilayan, A. I., & Sanchez-Sinencio, E.
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Fischer, TW||Karsilayan, AI||Sanchez-Sinencio, E
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Research
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Amplifiers
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Cmos Analog Integrated Circuits
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Floating Gate
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Rail-to-rail Amplifier
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http%3A%2F%2Fdx.doi.org%2F10.1109%2Ftcsi.2004.840290