Temperature stabilized voltage controlled oscillator

Details Temperature stabilized voltage controlled oscillator Temperature stabilized voltage controlled oscillator

2007-01-16

2007-01-16

Kinkead, Arnold (Department: 2817)

Oscillators

Frequency stabilization

Temperature or current responsive means in circuit

C331S17700V, C331S03600C, C331S016000

Reexamination Certificate

active

11066990

ABSTRACT:
A Voltage Controlled Oscillator (VCO) in a battery-powered device, such as a cellular phone, can be configured to tune across a fairly wide frequency range using a relatively narrow control voltage range. The frequency response of the VCO can be temperature compensated by applying a temperature variable voltage source to varactors that form part of a VCO resonant circuit. The reference end of the varactor can be supplied with a temperature dependent voltage source that has a temperature dependence that substantially compensates for varactor temperature dependence. The temperature dependent voltage source can be a Proportional To Absolute Temperature (PTAT) device.

REFERENCES:
patent: 4833426 (1989-05-01), Robichon et al.
patent: 4978930 (1990-12-01), Suter
patent: 6426680 (2002-07-01), Duncan et al.
patent: 7005936 (2006-02-01), Tanzawa
patent: 2003/0076139 (2003-04-01), Miyagawa et al.
patent: 2004/0041639 (2004-03-01), Fujita
patent: 02097964 (2002-12-01), None

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