Abstract
A circuit topology for high-swing, high-linearity class-AB CMOS operational amplifiers has been developed. The technique uses parallel-connected input pairs with appropriate DC bias/level shifting circuitry to obtain an input common-mode voltage range that equals or exceeds the output linear range, and is nearly equal to the total power supply voltage. High linearity is achieved by summing the DC bias and AC small-signal currents so that the small-signal voltage gain is approximately constant over the full input common-mode voltage range. >
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