FRACTIONAL-N SYNTHESIZED CHIRP GENERATOR

摘要

A fractional-N synthesized chirp generator includes a fractional-N synthesizer and a digital ramp synthesizer. The fractional-N synthesizer has a frequency synthesizer and a sigma-delta modulator module. The fractional-N synthesizer is configured to receive a reference frequency input signal and a frequency control value. The fractional-N synthesizer is configured to transform the reference frequency signal and the frequency control value to a chirped radio frequency (RF) output signal in a deterministic manner. The digital ramp synthesizer is configured to receive the reference frequency input signal and configured to generate the frequency control value utilizing the reference frequency input signal. The digital ramp synthesizer is further configured to provide the frequency control value to the fractional-N synthesizer. The frequency control value varies with time.