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Phased locked loop integrated circuit

  • US 10,560,109 B2
  • Filed: 05/04/2018
  • Issued: 02/11/2020
  • Est. Priority Date: 12/29/2017
  • Status: Active Grant
First Claim
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1. An oscillator system, comprising:

  • a first integrated circuit; and

    a second integrated circuit, wherein the second integrated circuit and the first integrated circuit comprise a same circuitry;

    wherein each of the first integrated circuit and the second integrated circuit comprises;

    phase locked loop (PLL) circuitry;

    voltage controlled oscillator (VCO) circuitry; and

    interface circuitry;

    wherein;

    the PLL circuitry of the first integrated circuit is coupled to the VCO circuitry of the second integrated circuit; and

    the interface circuitry of the first integrated circuit controls calibration of the VCO circuitry of the second integrated circuit;

    wherein the PLL circuitry comprises;

    a reference signal input terminal;

    a reference frequency divider circuit coupled to the reference signal input terminal;

    a reference signal output terminal;

    a switch coupled to the reference frequency divider circuit and to the reference signal output terminal, the switch configured to switchably connect the reference frequency divider circuit to the reference signal output terminal;

    a phase detector coupled to the reference frequency divider circuit;

    a charge pump coupled to the phase detector; and

    a charge pump output terminal coupled to the charge pump.

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