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Oscillator including varactor circuit and method of operation thereof

  • US 10,523,154 B2
  • Filed: 04/23/2018
  • Issued: 12/31/2019
  • Est. Priority Date: 08/16/2017
  • Status: Active Grant
First Claim
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1. An oscillator, comprising:

  • a control voltage generator configured to generate a control voltage based on dividing a power voltage that was received;

    an offset voltage generator configured to generate an offset voltage based on dividing the power voltage that was received;

    a phase locked loop (PLL) comprising a varactor circuit configured to modify a capacitance based on the control voltage and the offset voltage, wherein the PLL is configured to output an oscillation signal comprising an oscillation frequency based on the capacitance; and

    a calibration logic circuit configured to provide a selection control signal to the control voltage generator based on the oscillation signal, and configured to provide an offset control signal to the offset voltage generator based on the oscillation signal,wherein the calibration logic circuit comprises;

    a register configured to store frequency information associated with the oscillation signal;

    a calculation logic circuit configured to calculate a first value based on the frequency information stored in the register;

    a comparator circuit configured to provide a result signal responsive to determining whether the first value is greater than a reference value; and

    a control logic circuit configured to output the selection control signal and the offset control signal based on the result signal from the comparator circuit.

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