A 0.9-V 0.5-/spl mu/A, rail-to-rail CMOS operational amplifier designed with weak inversion techniques is presented. Depletion-mode nMOS transistors buffer a bulk-driven pMOS differential pair to realize wide input dynamic range, while the output stage architecture provides symmetric rail-to-rail output drive through the use of a low-voltage translinear control circuit.
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Stockstad et al. (2002) studied this question.
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