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US 4,731,592 AGranted
Voltage controllable oscillator
AssigneeSony Corporation
InventorsAkiro Sato, Jun Ono, Kenichiro Kumamoto, Koichi Ohya
Life of this patent
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Abstract
An integrated voltage controllable oscillator having a transistor for oscillation is further provided with a resonance circuit externally connected to two electrodes of the transistor for oscillation and including a variable capacitance element adapted to vary a resonance frequency of the resonance circuit, and a high impedance element connected between the variable capacitance element and the ground in a circuit adapted to supply a control voltage to the variable capacitance element.
Claims7
An integrated voltage controllable oscillator comprising:
- an integrated circuit including a transistor for oscillation having an emitter, a collector and a base connected to respective pins on said integrated circuit;
- a protective diode connected between said collector and ground;
- resonance circuit means externally connected to said collector and said base by way of said respective pins for oscillation;
- variable capacitance means for varying a resonance frequency of said resonance circuit means;
- and high impedance means connecting said resonance circuit means and said variable capacitance means to ground in a circuit for supplying a control voltage to said variable capacitance means, thereby reducing the influence of said protective diode on the operation of said resonance circuit means.
2 more elements
Dependencies are inferred from the claim text.