Variable capacitance circuit and wireless communication device
AssigneeSony Semiconductor Solutions Corporation
InventorHiroaki Nagano
Life of this patent
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Abstract
To achieve higher self-resonant frequency and lower parasitic resistance of a variable capacitance circuit whose capacitance value is changeable. The variable capacitance circuit includes a capacitor unit, a reactive element, and a bias circuit. The capacitor unit inside the variable capacitance circuit includes plural semiconductor elements connected in series, the plural semiconductor elements each having a capacitance value based on a bias voltage applied thereto. Further, the reactive element inside the variable capacitance circuit is connected to the capacitor unit. The bias circuit inside the variable capacitance circuit applies a bias voltage to each of the plural semiconductor elements.
Claims20
A variable capacitance circuit, comprising:
- a capacitor unit including plural semiconductor elements connected in series, the plural semiconductor elements each having a capacitance value based on a bias voltage applied thereto;
- a reactive element connected to the capacitor unit;
- and
- a bias circuit configured to apply the bias voltage to each of the plural semiconductor elements,
- wherein the plural semiconductor elements include respective transistors,
- wherein the bias circuit applies, as the bias voltage, any of an on voltage for turning on the transistors and an off voltage for turning off the transistors, and
- wherein at least two of the transistors have different gate widths.
A variable capacitance circuit, comprising:
- a capacitor unit including plural semiconductor elements connected in series, the plural semiconductor elements each having a capacitance value based on a bias voltage applied thereto;
- a reactive element connected to the capacitor unit;
- and
- a bias circuit configured to apply the bias voltage to each of the plural semiconductor elements,
- wherein the reactive element is connected to the capacitor unit in series, and
- wherein the reactive element includes an antenna radiator.
A variable capacitance circuit, comprising:
- a capacitor unit including plural semiconductor elements connected in series, the plural semiconductor elements each having a capacitance value based on a bias voltage applied thereto;
- a reactive element connected to the capacitor unit;
- and
- a bias circuit configured to apply the bias voltage to each of the plural semiconductor elements,
- wherein the plural semiconductor elements include respective transistors,
- wherein the bias circuit applies, as the bias voltage, any of an on voltage for turning on the transistors and an off voltage for turning off the transistors, and
- wherein the transistors each include a transistor including a gate electrode with a linear shape.
A variable capacitance circuit, comprising:
- a capacitor unit including plural semiconductor elements connected in series, the plural semiconductor elements each having a capacitance value based on a bias voltage applied thereto;
- a reactive element connected to the capacitor unit;
- and
- a bias circuit configured to apply the bias voltage to each of the plural semiconductor elements,
- wherein the plural semiconductor elements each include a diode pair circuit including a pair of diodes having anodes connected to each other, and
- wherein the bias circuit applies any of a forward voltage and a backward voltage to the pair of diodes individually as the bias voltage.
A variable capacitance circuit, comprising:
- a capacitor unit including plural semiconductor elements connected in series, the plural semiconductor elements each having a capacitance value based on a bias voltage applied thereto;
- a reactive element connected to the capacitor unit;
- and
- a bias circuit configured to apply the bias voltage to each of the plural semiconductor elements,
- wherein the reactive element is connected to the capacitor unit in series, and
- wherein the capacitor unit is connected to each end of the reactive element.
A wireless communication device comprising:
- a capacitor unit including plural semiconductor elements connected in series, the plural semiconductor elements each having a capacitance value based on a bias voltage applied thereto;
- a reactive element connected to the capacitor unit;
- a bias circuit configured to apply the bias voltage to each of the plural semiconductor elements;
- and
- an antenna radiator connected to at least one of the capacitor unit or the reactive element.
Dependencies are inferred from the claim text.