Patent ID: 7227404
Filing Date: 2007-06-05
Classification: G05F

Abstract:
1. A method for preventing regulated supply undershoot in state retained latches of a leakage controlled system, the method comprising the steps of: providing a leakage control voltage source configured to supply a sleep voltage level below an active operation core voltage level and above a predetermined minimum level during a sleep mode, such that the sleep voltage is high enough to allow logic device state retention in the leakage controlled system; and biasing the voltage source via a reference voltage, wherein the reference voltage is provided via a charge storage device that is pre-charged to the active operation core voltage level when the system is in its active mode, such that when the system enters its sleep mode, the reference voltage slowly decays to the sleep voltage level, and further such that when the system enters its sleep mode, the output of the voltage source goes through its transient phase and undershoots at a voltage level higher than the sleep voltage before finally settling to the sleep voltage level.