Phase-locked loop having a multi-band oscillator and method for calibrating same
AssigneeAnalog Devices Global
InventorsPablo Cruz Dato, Declan D. Dalton, Patrick G. Crowley
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Abstract
A phase-locked loop (PLL) comprising a multi-band oscillator and a memory configured to store control input for the oscillator. The PLL is operable in a calibration mode in which the PLL is configured to acquire a frequency controlled word (FCW) for the PLL corresponding to a frequency generated by the oscillator in response to a first control input threshold on a first band of the oscillator; generate a frequency corresponding to said FCW on a second band of the oscillator adjacent to said first band; identify a second control input causing the oscillator to generate said frequency corresponding to said FCW and store said second control input in memory.
Claims24
A phase-locked loop (PLL) comprising a multi-band oscillator and a memory configured to store a control input for the oscillator, wherein the PLL is operable in a calibration mode in which the PLL is configured to:
- acquire a frequency controlled word (FCW) for the PLL corresponding to a frequency generated by the oscillator in response to a first control input threshold on a first band of the oscillator;
- generate a frequency corresponding to said FCW on a second band of the oscillator adjacent to said first band;
- and
- identify a second control input causing the oscillator to generate said frequency corresponding to said FCW and store said second control input in said memory.
A frequency modulated continuous wave (FMCW) radar device comprising a frequency ramp generator configured to produce a frequency ramp signal, and a transceiver configured to transmit and receive said frequency ramp signal, the frequency ramp generator having a phase-locked loop (PLL) comprising a multi-band oscillator, and a memory configured to store control input for the oscillator, wherein the PLL is operable in a calibration mode in which the PLL is configured to:
- acquire a frequency controlled word (FCW) for the PLL corresponding to a frequency generated by the oscillator in response to a first control input threshold on a first band of the oscillator;
- generate a frequency corresponding to said FCW on a second band of the oscillator adjacent to said first band;
- and
- identify a second control input causing the oscillator to generate said frequency corresponding to said FCW and store said second control input in said memory.
A frequency calibration method for a phase-locked loop (PLL) comprising a multi-band oscillator, the method comprising:
- providing a look-up table in a memory of the PLL to store control input for the oscillator;
- acquiring a frequency controlled word (FCW) for the PLL corresponding to a frequency generated by the oscillator in response to a first control input threshold on a first band of the oscillator;
- and
- generating a frequency corresponding to said FCW on a second band of the oscillator adjacent to said first band;
- and
- identifying a second control input causing the oscillator to generate said frequency corresponding to said FCW and storing said second control input in said memory.
Dependencies are inferred from the claim text.