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US 6,720,835 B2Granted
Voltage-controlled oscillation circuit
AssigneeOki Electric Industry Co., Ltd.
InventorKen Fujita
Life of this patent
Estimating the term…
Abstract
A voltage-controlled oscillation (VCO) circuit includes a current generator, a variable capacitor having a capacitance value which changes in accordance with a tuning voltage, an inductor which is electrically connected to the variable capacitor in parallel, and a fixed, capacitor which is electrically connected to the variable capacitor in parallel. The variable capacitor is electrically connected to the current generator in series.
Claims27
A voltage-controlled oscillation (VCO) circuit, comprising:
- a current generator;
- a variable capacitor having a capacitance value which changes in accordance with a tuning voltage, and which is electrically connected to the current generator in series;
- an inductor which is electrically connected to the variable capacitor in parallel;
- and
- a fixed capacitor which is electrically connected to the variable capacitor in parallel, and which has a set capacitance,
- wherein the VCO circuit has first, second and third metal layers, wherein the fixed capacitor includes a lower electrode which is formed as the first metal layer and an upper electrode which is formed as the second metal layer, and wherein the inductor is electrically connected to the variable capacitor by a pair of wiring layers which are formed as the third metal layer.
3 more elements
A voltage-controlled oscillation (VCO) circuit, comprising:
- a current generator;
- a variable capacitor having a capacitance value which changes in accordance with a tuning voltage, and which is electrically connected to the current generator in series;
- an inductor which is electrically connected to the variable capacitor in parallel;
- and
- a fixed capacitor which is electrically connected to the variable capacitor in parallel, and which has a set capacitance,
- wherein the VCO circuit has first, second and third metal layers, wherein the fixed capacitor includes a lower electrode which is formed as the first metal layer and an upper electrode, and wherein the inductor is electrically connected to the variable capacitor by a pair of wiring layers which are formed as the second metal layer.
3 more elements
A voltage-controlled oscillation (VCO) circuit, comprising:
- a current generator;
- a variable capacitor having a capacitance value which changes in accordance with a tuning voltage, and which is electrically connected to the current generator in series;
- an inductor which is electrically connected to the variable capacitor in parallel;
- and
- an even number of fixed capacitors which are electrically connected to the variable capacitor in parallel, the fixed capacitors having a same structure and a same capacitance,
- wherein the VCO circuit has first, second and third metal layers, wherein the fixed capacitors respectively include a lower electrode which is formed as the first metal layer and an upper electrode which is formed as the second metal layer, and wherein the inductor is electrically connected to the variable capacitor by a pair of wiring layers which are formed as the third metal layer.
3 more elements
A voltage-controlled oscillation (VCO) circuit, comprising:
- a current generator;
- a variable capacitor having a capacitance value which changes in accordance with a tuning voltage, and which is electrically connected to the current generator in series;
- an inductor which is electrically connected to the variable capacitor in parallel;
- and
- an even number of fixed capacitors which are electrically connected to the variable capacitor in parallel, the fixed capacitors having a same structure and a same capacitance,
- wherein the VCO circuit has first, second and third metal layers, wherein the fixed capacitors respectively include a lower electrode which is formed as the first metal layer and an upper electrode, and wherein the inductor is electrically connected to the variable capacitor by a pair of wiring layers which are formed as the second metal layer.
3 more elements
A voltage-controlled oscillation (VCO) circuit, comprising:
- a current generator;
- a variable capacitor having a capacitance value which changes in accordance with a tuning voltage, and which is electrically connected to the current generator in series;
- an inductor which is electrically connected to the variable capacitor in parallel;
- and
- an even number of fixed capacitors which are electrically connected to the variable capacitor in parallel, the fixed capacitors having a same structure and a same capacitance,
- wherein the VCO circuit has first and second metal layers, wherein the fixed capacitors respectively include a lower electrode which is formed as the first metal layer and an upper electrode, and wherein the inductor is electrically connected to the variable capacitor by a pair of wiring layers which are formed as the second metal layer.
3 more elements
Dependencies are inferred from the claim text.