Patent ID: 7511535
Filing Date: 2009-03-31
Classification: H03K

Abstract:
1. A power management circuit for controlling power dissipation in at least a first combinational logic circuit, the power management circuit comprising: a detector operative to receive at least a first input signal to the first combinational logic circuit and to detect a transition of the first input signal between a first logic state and a second logic state, the detector generating a first control signal indicative of whether or not a transition of the first input signal has occurred; and a controller operative to receive the first control signal generated by the detector and to selectively disconnect the first combinational logic circuit from a power supply to the first combinational logic circuit when no logic transition of the first input signal is detected between a preceding computational cycle and a present computational cycle of the first combinational logic circuit, and to connect the first combinational logic circuit to the power supply when a logic transition of the first input signal is detected between preceding and present computational cycles of the first combinational logic circuit; wherein the detector comprises: