Voltage controlled oscillator having constant tuning bias voltag

Details Voltage controlled oscillator having constant tuning bias voltag Voltage controlled oscillator having constant tuning bias voltag

1988-02-11

1989-05-30

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331175, 331177V, H03B 518, H03L 100

Patent

active

048354929

ABSTRACT:
Disclosed is a local oscillator using a dielectric coaxial resonator (27), which is availably used as a fixed local oscillator in double-spot tuners and CATV converters, and which is arranged so that an AFC voltage is applied to a variable-capacitance diode (23) from an output terminal (E) of a frequency control circuit through a first resistor (35), the variable-capacitance diode having its one end being connected to a center conductor of a dielectric coaxial resonator (27) through a capacitor (25) and its other end being AC grounded, and that a first reference potential (V.sub.A) lower than a source voltage (V.sub.CC) by a predetermined value is given to the variable-capacitance diode (23), the one end of the variable-capacitance diode (23) being connected to the source voltage (V.sub.CC) through a second resistor (22), whereby the voltage impressed across the variable-capacitance diode (23) can be kept constant regardless of a variation in the source voltage to thereby prevent the oscillation frequency from fluctuating.

REFERENCES:
patent: 4751475 (1988-06-01), Kubo et al.
National Technical Report TV62-0004 Apr. 1985 vol. 31 No. 2 (no translation) pp. 115-123.

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