Patent ID: 7218153

Claim:
A circuit system comprising: a first inverter coupled between a supply voltage and a complementary input signal, for generating a first output signal on an output terminal thereof in response to an input signal received by an input terminal thereof; a blockage module coupled to the output terminal of the first inverter for selectively passing the first output signal there across in response to the input signal and the complementary input signal; and a second inverter coupled between the supply voltage and a complementary supply voltage, having a first input terminal directly coupled to the output terminal of the first inverter and a second input terminal coupled to the same via the blockage module for generating a second output signal in response to the first output signal, wherein the blockage module prevents the first output signal from passing to the second input terminal of the second inverter when the input signal is at a low level and the complementary input signal is at a high level, thereby reducing a leakage current at the second inverter.