Voltage controlled oscillator circuit capable of switching betwe

Details Voltage controlled oscillator circuit capable of switching betwe Voltage controlled oscillator circuit capable of switching betwe

1998-01-13

1999-10-26

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Converting input current or voltage to output frequency

331177V, H03C 300

Patent

active

059735198

ABSTRACT:
A voltage controlled oscillator circuit having a negative resistance section for supplying electric power to the voltage controlled oscillator circuit and a parallel resonance circuit includes a first variable capacitance diode and a second variable capacitance diode which are connected in parallel. The first variable capacitance diode varies its capacitance according to a first control voltage and thereby varies oscillation frequency of the voltage controlled oscillator circuit. The second variable capacitance diode varies its capacitance according to a second control voltage which is independent of the first control voltage, and thereby varies the oscillation frequency of the voltage controlled oscillator circuit independently. Coupling condensers are provided between the negative resistance section and the first variable capacitance diode, and between the first variable capacitance diode and the second variable capacitance diode to cut off direct current.

REFERENCES:
patent: 4216451 (1980-08-01), Nishimura et al.
patent: 4518930 (1985-05-01), Rozema et al.
patent: 4801898 (1989-01-01), Obayashi
patent: 5101177 (1992-03-01), Norimatsu
patent: 5748051 (1998-05-01), Lewis
patent: 5856763 (1999-01-01), Reeser et al.

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