Voltage-controlled oscillator

Details Voltage-controlled oscillator Voltage-controlled oscillator

2006-01-31

2006-01-31

Mis, David (Department: 2817)

Oscillators

With frequency adjusting means

With voltage sensitive capacitor

C331S008000, C331S011000, C331S017000, C331S034000, C331S057000, C360S051000

Reexamination Certificate

active

06992536

ABSTRACT:
A voltage-controlled oscillator (VCO) enabling proper gain adjustment with a simple configuration. The VCO includes a first current source for generating a first control current in accordance with the first control voltage and a second current source for generating a second control current in accordance with the second control voltage. A control voltage generation circuit synthesizes the first and second control currents to generate an oscillation control voltage in accordance with the synthesized current. A ring oscillator generates an oscillation signal with a frequency corresponding to the oscillation control voltage. The first current source varies a changing amount of the first control current relative to a change in the first control voltage. The second current source varies a changing amount of the second control current relative to a change in the second control voltage.

REFERENCES:
patent: 4511859 (1985-04-01), Dombrowski
patent: 5072195 (1991-12-01), Graham et al.
patent: 5088080 (1992-02-01), Ishibashi et al.
patent: 5363419 (1994-11-01), Ho
patent: 5933037 (1999-08-01), Momtaz
patent: 5982208 (1999-11-01), Kokubo et al.
patent: 6215835 (2001-04-01), Kyles
patent: 6222421 (2001-04-01), Kiyose
patent: 6812754 (2004-11-01), Nakanishi

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