Voltage controlled oscillator circuit
AssigneeVictor Company of Japan, Ltd.
InventorNobuaki Takahashi
Life of this patent
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Abstract
A voltage controlled oscillator circuit comprises a voltage controlled oscillator circuit, first and second constant-current circuits respectively for causing first and second constant currents, current dividing means for dividing the first constant current in accordance with an outside control voltage, and means for adjustably varying the control voltage. The oscillation frequency is controlled responsive to an input control current equal to the sum of one of the divided currents and the second constant current. The adjustment means causes an adjustment of the output currents of the current dividing means and of the free-running oscillation frequency.
Claims6
A voltage controlled oscillator circuit comprising:
- a voltage controlled oscillator means for generating a signal having a frequency which is proportional to an input control current;
- a first constant-current circuit means for producing a first constant current;
- current dividing means having a pair of points to which a control voltage is applied from the outside, said dividing means dividing said first constant current in accordance with the control voltage;
- a second constant-current circuit means for producing a second constant current;
- means for supplying a current which is equal to the sum of one part of said divided current and said second constant current, said sum current forming said input control current to said voltage controlled oscillator;
- and adjusting means for adjustably varying said control voltage, whereby the output current of said current dividing means is adjusted, and the free-running oscillation frequency of said voltage controlled oscillator is adjusted.
Dependencies are inferred from the claim text.