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Method and apparatus to improve frequency stability of an integrated circuit oscillator

  • US 20060139111A1
  • Filed: 02/23/2006
  • Published: 06/29/2006
  • Est. Priority Date: 11/19/2003
  • Status: Active Grant
First Claim
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1. A circuit, comprising:

  • a capacitor coupled to be alternatingly charged and discharged by first and second current sources;

    a first voltage follower circuit including a first bipolar transistor having a base coupled to the capacitor, the first bipolar transistor biased such that a voltage at an emitter of the first bipolar transistor follows a voltage on the capacitor;

    a current mirror having first and second current paths, the first current path coupled to the base of the first bipolar transistor, the first current path providing substantially all of a base current received by the base of the first bipolar transistor; and

    a second voltage follower circuit including a second bipolar transistor having a base coupled to the second current path, the second current path providing substantially all of a base current received by the base of the second bipolar transistor.

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