Modulators – Frequency modulator – Including microwave or distributed parameter structure
Patent
1997-11-17
1999-05-18
Grimm, Siegfried H.
Modulators
Frequency modulator
Including microwave or distributed parameter structure
331117D, 331177V, 332136, H03B5/12
Patent
active
059054140
ABSTRACT:
A voltage controlled oscillator having a reduced oscillation frequency-modulation sensitivity variation and having a positive modulation function is designed to: (a) reduce the modulation variation by making the rate of change in oscillation frequency with a certain change in a modulation signal generally constant with respect to a wide range of oscillation frequencies; (b) reduce the manufacturing cost by using only one varactor diode; and (c) reduce the cost of a system using the voltage controlled oscillator by eliminating the need for correction of the modulation variation on the side of a system using the oscillator. In a variable capacitance circuit of the voltage controlled oscillator, the cathode of a varactor diode is connected to a control voltage terminal and is also connected to a modulation signal input terminal by a coupling resistor and a voltage dividing resistor.
REFERENCES:
patent: 3581240 (1971-05-01), Enderby
patent: 4088968 (1978-05-01), Pradal et al.
patent: 4303894 (1981-12-01), Akazawa
patent: 5187451 (1993-02-01), Nakamoto et al.
Grimm Siegfried H.
Murata Manufacturing Co. Ltd.
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