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Embedded structure circuit for VCO and regulator

  • US 20070262825A1
  • Filed: 04/28/2006
  • Published: 11/15/2007
  • Est. Priority Date: 04/28/2006
  • Status: Active Grant
First Claim
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1. An oscillation circuit formed in a single semiconductor chip, comprising:

  • a first power supply terminal supplied with a first source voltage;

    a second power supply terminal supplied with a second source voltage different from the first source voltage;

    a voltage regulator for receiving a voltage from the first power supply terminal and outputting a source voltage; and

    a voltage controlled oscillation circuit supplied with the source voltage from the voltage regulator; and

    a current source circuit connected to the second power supply terminal;

    wherein the voltage regulator, the voltage controlled oscillation circuit and the current source circuit are connected in series between the first and second power supply terminals, and the current supplied from the voltage regulator to the voltage controlled oscillation circuit flows in the current source circuit.

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