A Gain-Boosted Discrete-Time Charge-Domain FIR LPF with Double-Complementary MOS Parametric Amplifiers

Discrete-time charge-domain filters with FIR characteristics require the resetting of their sampling capacitors for every cycle.The gain boosting techniques presented in this paper are especially useful when applied to a high-order discrete-time charge-domain filter, where a multi-stage implementation is strongly preferred to obtain a large gain with appropriate circuit complexity. The chip is implemented in a 0.13 mum CMOS process. Implementation of the DCMPA for the discrete-time charge-domain filter is of practical significance as it easily provides the variable-gain capability. Triple wells are used to better isolate the DCMPAs from the clock pulse generator.