Patent ID: 7203847

Claim:
A power supply for a central processing unit, comprising: a first circuit to supply a voltage of a first level to said central processing unit when said central processing unit is in a first activity state; a second circuit to supply a voltage of a second level to said central processing unit when said central processing unit is in a second activity state, said second level being different than said first level; a third circuit to determine whether the central processing unit is in the first or second activity state and to output a control signal to the first and second circuits as a result of the determination, wherein the first activity state is a high activity state and the second activity state is a low activity state and wherein the first circuit is enabled to output the first-level voltage when the control signal assumes a first logical value and the second circuit is enabled to output the second-level voltage when the control signal assumes a second logical value; a comparator to compare voltage identification data (VID) to pre-stored data, wherein the first circuit generates a V DAC voltage based on the comparison.