A fast chirp Phase Locked Loop with a boosted return time includes a Voltage Controlled Oscillator, VCO, generating a Frequency Modulated Continuous Waveform, FMCW. The VCO responds to a filtered output voltage of a filter connected to a charge pump. A digital controller modifies the FMCW to generate a chirp phase and a return phase. The chirp phase includes a first linear change of the FMCW from a start frequency to a stop frequency. The return phase includes a second linear change of the FMCW from the stop frequency to the start frequency. A boost circuit connects to the digital controller and the filter. The boost circuit supplies a boost current during the return phase. The boost current is proportional to a return slope of the return phase and inversely proportional to a VCO gain of the VCO.

A fast chirp Phase Locked Loop (70) with a boosted return time includes a Voltage Controlled Oscillator, VCO, (12) generating a Frequency Modulated Continuous Waveform, FMCW, (14). The VCO responds to a filtered output voltage (74) of a filter (72) connected to a charge pump (28). A digital controller (82) modifies the FMCW to generate a chirp phase (304) and a return phase (300). The chirp phase includes a first linear change of the FMCW from a start frequency (202) to a stop frequency (204). The return phase includes a second linear change of the FMCW from the stop frequency to the start frequency. A boost circuit (86) connects to the digital controller and the filter. The boost circuit supplies a boost current (98) during the return phase. The boost current is proportional to a return slope of the return phase and inversely proportional to a VCO gain of the VCO.