Patent ID: 7449960
Filing Date: 2008-11-11
Classification: H03C,H03L

Abstract:
1. A frequency synthesizer comprising: combiner circuitry adapted to combine an initial fractional divide value and a linearized modulation signal to provide a combined fractional divide value; a fractional-N divider adapted to fractionally divide a reference signal based on the combined fractional divide value to provide a divided reference signal; loop circuitry adapted to provide an output signal based on the divided reference signal and a feedback signal; feedback circuitry adapted to provide the feedback signal based on mixing the output signal and a local oscillator signal; second frequency synthesizer circuitry adapted to provide the local oscillator signal based on a control value; and linearization circuitry adapted to process a modulation signal to provide the linearized modulation signal such that a modulation component of the output signal has a substantially linear relationship to the modulation signal.