Patent ID: 6141394
Filing Date: 2000-10-31
Classification: H03L

Abstract:
An electronic device with a fractional-N frequency synthesizer comprising:a VCO with an output for supplying an output signal of a particular frequency, and an input for receipt of a control signal for controlling the operation of the VCO;a divider, operably coupled to the VCO, that is configured to divide the particular frequency of the output signal by a controllable divisor to produce a feedback signal,a fractional controller, operably coupled to the divider, that is configured to control the controllable divisor;a phase detector, operably coupled to the divider, that is configured to compare the feedback signal with an other signal to produce an error signal;a filter, operably coupled to the phase detector, that is configured to receive the error signal and to provide the control signal for controlling the operation of the VCO;compensation circuitry comprising a charge pump operably coupled to the filter and the VCO, that is configured to supply a compensation current that is synchronous with the output signal, for compensating the output signal for phase jitter.