The capacitor coupling circuits are applied in the high frequency circuit. It concern the coupling coefficient that the resonance property and frequency property.

But when the sampling frequency of successive-approximation ADC is too high, the switched capacitor can't be charged properly. And this will result in too big conversion error.

A novel double-sampling double-delay switched capacitor resonator with high performance is proposed. High notch Q-value and accurate notch frequency are analyzed at the transfer function level.