Constant-gm rail-to-rail CMOS op-amp input stage withoverlapped transition regions |
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Authors: | Minsheng Wang Mayhugh TL Jr Embabi SHK Sanchez-Sinencio E |
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Affiliation: | Dept. of Electr. Eng., Texas A&M Univ., College Station, TX; |
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Abstract: | Conventional techniques to achieve a constant-gm rail-to-rail complementary N-P differential input stage require complex additional circuitry. In addition, the frequency response and common-mode rejection ratio (CMRR) are degraded. An economical but efficient design technique to overcome these problems is proposed. The proposed technique strategically overlaps the transition regions of the tail currents for the n- and p-pairs to achieve constant overall transconductance. Experimental results demonstrate that gm variation can be restricted to within ±4% with improved CMRR and frequency response |
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