Patent ID: 7667545

Claim:
A lock loop circuit, comprising: a precharge circuit that is operative to provide a precharge signal; an oscillator circuit that is operative to provide an output frequency signal in response to a steering signal that is based on the precharge signal; a calibration circuit, having at least one register, the calibration circuit being operative to, prior to the lock loop circuit entering a disabled mode of operation, determine a calibration value for the precharge circuit based on the precharge signal and the steering signal and to store the calibration value as a digital calibration value in the register; and a floating ground loop filter circuit, including at least one capacitive element, that is operative to provide the steering signal in response to the precharge signal, wherein the precharge circuit is operative to control the floating ground loop filter to bypass the at least one capacitive element for a period of time prior to the calibration circuit determining the calibration value.