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Input-switching voltage-controlled oscillator and PLL-controlled oscillator

  • US 6,791,421 B2
  • Filed: 10/23/2002
  • Issued: 09/14/2004
  • Est. Priority Date: 10/24/2001
  • Status: Expired due to Fees
First Claim
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1. An input-switching voltage-controlled oscillator, comprising:

  • a phase-locked loop (PLL) provided with a variable-voltage capacitance element and a voltage-controlled oscillator;

    a source of voltage independent of the variable-voltage capacitance element; and

    a switch for selecting one of a plurality of voltages including the variable-voltage capacitance and the independent voltage source in accordance with a selection signal and applying said selected voltage as a control voltage to the voltage-controlled oscillator, wherein when the selection signal is supplied, the switch selects said variable voltage capacitance element as a normal operation mode to operate the voltage-controlled oscillator as a PLL-controlled oscillator.

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