Phase preset for fast chirp PLL

A fast chirp Phase Locked Loop with a phase preset 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 chi...

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Bibliographische Detailangaben
Hauptverfasser:	Vigier, Jean-Stephane, Orlando, Julien, Salle, Didier, Pavao-Moreira, Cristian
Format:	Patent
Sprache:	eng
Schlagworte:	ANALOGOUS ARRANGEMENTS USING OTHER WAVES AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATIONOF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES BASIC ELECTRONIC CIRCUITRY DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES ELECTRICITY GENERATION OF NOISE BY SUCH CIRCUITS GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING,BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN ANON-SWITCHING MANNER LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES MEASURING MODULATION PHYSICS RADIO DIRECTION-FINDING RADIO NAVIGATION TESTING
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Beschreibung
Zusammenfassung:	A fast chirp Phase Locked Loop with a phase preset 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 phase preset circuit connects to the digital controller and the filter. The phase preset circuit supplies a phase preset current during a start frequency time preceding the chirp phase. The phase preset current is proportional to a VCO gain of the VCO and inversely proportional to a chirp current during the chirp phase.