Comparison of class A amplifiers for low-power and low-voltage switched capacitor applications

Owing to their higher output dynamic two-stage amplifiers may become an interesting alternative to cascoded single-stage amplifiers for low voltage switched capacitor applications. Therefore, a comparison of the minimum power consumption of both approaches, based on an optimisation methodology, is presented. It is worked out, which amplifier type should be used to achieve minimum power consumption for a given supply voltage, capacitor ratio and desired settling precision.