Voltage-controlled oscillator, transmitter, and receiver

Details Voltage-controlled oscillator, transmitter, and receiver Voltage-controlled oscillator, transmitter, and receiver

2008-07-29

2008-07-29

Mis, David (Department: 2817)

Oscillators

Frequency stabilization

C331S1170FE, C331S167000, C331S17700V, C331S179000

Reexamination Certificate

active

07405632

ABSTRACT:
A voltage-controlled oscillator includes (i) a first variable-capacity element, (ii) a resonance circuit whose resonance frequency changes in accordance with a control voltage applied to the first variable-capacity element, (iii) a second variable-capacity element connected in parallel with the first variable-capacity element, (iv) resonance frequency range switching means which switches the variation range of the resonance frequency of the resonance circuit by switching the capacity of the second variable-capacity element, and (v) a resonance frequency correction circuit which corrects the resonance frequency in such a manner as to prevent the ratio between resonance frequencies before and after the switching of the variation range from depending on the control voltage.

REFERENCES:
patent: 5434543 (1995-07-01), Brilka et al.
patent: 6954111 (2005-10-01), Muramatsu et al.
patent: 2002-151953 (2002-05-01), None
patent: 2003-229718 (2003-08-01), None

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