Patent ID: 7619452

Claim:
An apparatus comprising a charge pump to receive pulses as input and to generate a charge based on the pulses; and a mutual-charge canceling sample reset (MCSR) capacitor to receive the charge from charge pump and a reference clock, to cancel charge previously captured therein and to capture the received charge during each cycle of the reference clock, and to generate a proportional voltage based on the charge captured therein at end of each cycle of the reference clock and to output the proportional voltage, wherein the MCSR capacitor includes a first proportional capacitor; a second proportional capacitor having substantially identical capacitance value as and in parallel with the first proportional capacitor; a first switch pair to provide a direct parallel coupling of the first proportional capacitor and the second proportional capacitor; a second switch pair to provide a reversed parallel coupling of the first proportional capacitor and the second proportional capacitor.