Voltage-controlled oscillator, transmitter, and receiver
AssigneeSharp Kabushiki Kaisha
InventorYusuke Kishino
Life of this patent
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Abstract
A voltage-controlled oscillator includes (i) a first variable-capacity element, (ii) a resonance circuit whose resonance frequency changes in accordance with a control voltage applied to the first variable-capacity element, (iii) a second variable-capacity element connected in parallel with the first variable-capacity element, (iv) resonance frequency range switching means which switches the variation range of the resonance frequency of the resonance circuit by switching the capacity of the second variable-capacity element, and (v) a resonance frequency correction circuit which corrects the resonance frequency in such a manner as to prevent the ratio between resonance frequencies before and after the switching of the variation range from depending on the control voltage.
Claims13
A voltage-controlled oscillator, comprising:
- a resonance circuit which includes a first variable-capacity element, a resonance frequency of the resonance circuit being changed in accordance with a control voltage applied to the first variable-capacity element;
- resonance frequency range switching means which includes a second variable-capacity element connected in parallel with the first variable-capacity element, the resonance frequency range switching means switching a variation range of the resonance frequency of the resonance circuit by switching capacity of the second variable-capacity element;
- and
- resonance frequency correcting means which corrects the resonance frequency in such a manner as to prevent a ratio between resonance frequencies before and after switching the variation range of the resonance frequency from depending on the control voltage.
A voltage-controlled oscillator, comprising:
- a resonance circuit whose resonance frequency changes in accordance with a control voltage applied to a variable-capacity element, the resonance circuit including a resonance frequency range switching circuit which is connected in parallel with the variable capacity element and switches a variation range of the resonance frequency of the resonance circuit;
- and
- a resonance frequency correction circuit which corrects the resonance frequency in such a manner as to prevent a ratio between resonance frequencies before and after switching the variation range of the resonance frequency from depending on the control voltage.
Dependencies are inferred from the claim text.