Digital clamp for state retention

摘要

Described is an apparatus which comprises: a clamp coupled between a first power supply and a second power supply; and a circuit to operate with the second power supply, wherein the clamp is operable to adjust the second power supply when the apparatus enters a low power mode.

主权项

1. An apparatus comprising:
a clamp coupled between a first power supply and a second power supply, wherein the clamp includes a plurality of transistors; a circuit to operate with the second power supply; and a control unit to turn on and off the plurality of transistors to adjust the second power supply when the apparatus enters a low power mode, comprising:
a comparator to compare the second power supply with a reference, wherein the reference is received at the positive terminal of the comparator and the second power supply is received at the negative terminal of the comparator; anda counter to count up when the second power supply is higher than the reference and to count down when the second power supply is lower than the reference, wherein a higher count of the counter corresponds to more transistors of the clamp being turned off.