Oscillation device and mobile communication apparatus

Details Oscillation device and mobile communication apparatus Oscillation device and mobile communication apparatus

2007-10-02

2007-10-02

Mis, David (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

C331S03600C, C331S1170FE, C331S17700V

Reexamination Certificate

active

10969927

ABSTRACT:
A differential type voltage control oscillator is formed of a differential tank circuit, an oscillation transistor, and a differential variable capacitance circuit. The differential variable capacitance circuit has a configuration wherein at least one pair of varactor diodes are connected in an anti-parallel manner, and are separated by means of a plurality of capacitors in a direct current manner. In addition, a differential control voltage is generated by a charge pump circuit which is controlled by the output of a phase comparator, and the differential control voltage is directly applied across the anodes and the cathodes of the varactor diodes.

REFERENCES:
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B. Razavi; “RF Microelectronics 1st Edition—Cased,” Prentice Hall, Dec. 1997, ISBN: 0-13-887571-5, pp. 234-303 with English translation pp. 212-277.
Japanese Office Action dated Jul. 13, 2007 with English translation.

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