Dual differential LC voltage-controlled oscillator

Details Dual differential LC voltage-controlled oscillator Dual differential LC voltage-controlled oscillator

2006-06-20

2006-06-20

Chang, Joseph (Department: 2817)

Oscillators

Solid state active element oscillator

Transistors

C331S03600C

Reexamination Certificate

active

07064622

ABSTRACT:
A differential voltage-controlled oscillator (VCO) employs at least two pairs of varactors, each pair of varactors driven with a corresponding differential control voltage, to generate a differential oscillating waveform. The capacitance of each pair of varactors adds to form the total capacitance of an inductor-capacitor (LC) tank circuit of the VCO, which determines an oscillation frequency of the differential oscillating waveform of the VCO. One differential control voltage controls a capacitance of the first varactor pair for a relatively coarse adjustment of the oscillation frequency, and the other differential control voltage controls a capacitance of the second varactor pair for a relatively fine adjustment of the oscillation frequency.

REFERENCES:
patent: 6016082 (2000-01-01), Cruz et al.
patent: 6292065 (2001-09-01), Friedman et al.
patent: 6469587 (2002-10-01), Scoggins
patent: 6784753 (2004-08-01), Leenaerts et al.

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