Patent ID: 7253594
Filing Date: 2007-08-07
Classification: G06F

Abstract:
1. A system comprising: a plurality of components; a plurality of regulators, with each regulator providing a constant signal to a corresponding one of said plurality of components; a plurality of energy storage elements, with each energy storage element being connected to a path connecting a corresponding pair of component and regulator; and a shared sleep mode controller maintaining the energy level across each of said energy storage elements if the corresponding regulator is turned off, wherein said sleep mode controller comprises a single comparator which compares energy across said energy storage elements with corresponding threshold levels sequentially in a non-overlapping manner, said shared sleep mode controller further comprising: a bandgap reference generating a reference voltage and a reference current, said single comparator comparing said reference voltage with a voltage level present across one of said capacitors; a flip-flop latching a result of comparison of said comparator; and a plurality of transistors operating to inject said reference current to one of said capacitors.