Oscillator circuit suppressing variation of oscillation...

Details Oscillator circuit suppressing variation of oscillation... Oscillator circuit suppressing variation of oscillation...

2008-06-03

2008-06-03

Lee, Benny (Department: 2817)

Oscillators

With particular source of power or bias voltage

C331S03600C, C331S176000, C331S17700V, C331S186000

Reexamination Certificate

active

07382207

ABSTRACT:
An oscillator circuit includes: oscillating transistors; a resonance circuit that includes varactor diodes each having a cathode to which a control voltage for controlling an oscillation frequency is applied and that is coupled between a collector and a base of each of the oscillating transistors; and a bias power supply that applies the bias voltages to the anodes of the varactor diodes. The bias voltages are given negative temperature characteristics, and a variation in the oscillation frequency caused by a change in the capacitance values of the varactor diodes due to a temperature variation is corrected by varying the bias voltages corresponding to the temperature variation.

REFERENCES:
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patent: 6882237 (2005-04-01), Singh et al.
patent: 6927643 (2005-08-01), Lazarescu et al.
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patent: 7019598 (2006-03-01), Duncan et al.
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patent: 0 352 695 (1990-01-01), None
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European Search Report dated Oct. 25, 2006 from corresponding European Application No. 06007398.8-1233.

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