Patent ID: 7702059

Claim:
A phase-locked loop circuit having an adjustable transfer function, comprising: a programmable charge pump; a programmable phase-locked loop filter operatively connected to said programmable charge pump; a programmable gain voltage controlled oscillator, operatively connected to said phase-locked loop filter, to generate a frequency signal based upon a signal received from said phase-locked loop filter; an integer-N divider operatively connected to an output of said programmable gain voltage controlled oscillator; a phase and frequency detector operatively connected between said integer-N divider and said programmable charge pump; a latch configured to generate a data stream by sampling data transmitted from a second phase-locked loop circuit, the sampling occurring based on the frequency signal; an error detector configured to monitor and detect errors in the data stream; and a transfer function controller configured to adjust the transfer function of the phase-locked loop circuit to approximate a transfer function of the second phase-locked loop circuit by, in response to a detected error, changing parameters associated with said programmable charge pump, said programmable phase-locked loop filter, or said programmable gain voltage controlled oscillator; said transfer function controller being operatively connected to said programmable charge pump, said programmable phase-locked loop filter, and said programmable gain voltage controlled oscillator.