Frequency tuning circuits and voltage-controlled oscillator...

Details Frequency tuning circuits and voltage-controlled oscillator... Frequency tuning circuits and voltage-controlled oscillator...

2006-05-02

2008-11-11

Pascal, Robert J. (Department: 2817)

Oscillators

With frequency adjusting means

With voltage sensitive capacitor

C331S1170FE, C331S167000, C331S03600C

Reexamination Certificate

active

07449970

ABSTRACT:
A frequency fine tuning circuit for use in a voltage-controlled oscillator is provided. The frequency tuning circuit includes a first varactor, a second varactor and a center bias unit. The second varactor is coupled to the first varactor at a first node. The center bias unit maintains a node voltage of the first node at a constant bias voltage level.

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