Patent ID: 6963232

Claim:
A circuit comprising: a phase detector having an output lead; a loop filter having an input lead, an output lead, a node and a first capacitor, the input lead of the loop filter being coupled to the output lead of the phase detector, wherein a leakage current leaks from the node and through the first capacitor; a voltage-controlled oscillator having an input lead coupled to the output lead of the loop filter, the voltage-controlled oscillator outputting an output signal, the output signal having a frequency that depends on a voltage on the node; and a leakage compensation circuit that supplies a compensation current onto the node, wherein the leakage compensation circuit includes a second capacitor, the first capacitor having a first area, the second capacitor having a second area, and the second area divided by the first area equaling a first ratio, wherein a replication leakage current leaks across the second capacitor, the replication leakage current divided by the leakage current equaling a second ratio, and wherein the first ratio substantially equals the second ratio.