Method and apparatus to improve frequency stability of an...

Details Method and apparatus to improve frequency stability of an... Method and apparatus to improve frequency stability of an...

2007-10-25

2009-02-17

Luu, An T (Department: 2816)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular frequency control means

C331S034000, C331S040000

Reexamination Certificate

active

07492229

ABSTRACT:
A simple low cost integrated circuit oscillator includes a capacitor coupled to be charged and discharged by first and second current sources. A first voltage follower circuit including a first bipolar transistor having a base is coupled to the capacitor. The first bipolar transistor is biased such that a voltage at an emitter of the first bipolar transistor follows a voltage on the capacitor. A first current path of a current mirror is coupled to the base of the first bipolar transistor. The first current path provides substantially all of a base current received by the base of the first bipolar transistor. A second voltage follower circuit including a second bipolar transistor having a base coupled to a second current path of the current mirror. The second current path provides substantially all of a base current received by the base of the second bipolar transistor.

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