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

  • US 7,034,625 B2
  • Filed: 11/19/2003
  • Issued: 04/25/2006
  • 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; and

    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 such that the base current received by the base of the first bipolar transistor includes substantially zero current received from the capacitor.

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