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US 5,539,359 AGranted
Voltage-controlled oscillator having voltage-sensitive capacitor with bias supply circuit
AssigneeMurata Manufacturing Co., Ltd.
InventorShinji Goma
Life of this patent
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Abstract
An impedance adjustment capacitor connected in parallel to a choke coil formed by a conductive pattern formed on a substrate adjusts the impedance of a control voltage applying circuit. A control voltage is applied via the choke coil to a variable capacitance diode included in a resonance circuit. This control voltage determines a resonance frequency.
Claims8
A resonance circuit for a voltage-controlled oscillator, comprising:
- a variable capacitance diode;
- a choke coil including a conductive pattern located on a substrate, and having one end supplied with a control voltage and another end connected to said variable capacitance diode, for controlling a resonance frequency of the resonance circuit;
- and
- an impedance adjustment capacitor connected in parallel to said choke coil for adjusting an impedance between said one end of said choke coil and said variable capacitance diode.
1 more element
A voltage-controlled oscillator, comprising:
- a resonance circuit including a variable capacitance diode;
- a choke coil including a conductive pattern located on a substrate, and having one end supplied with a control voltage and another end connected to said variable capacitance diode, for controlling a resonance frequency of the resonance circuit;
- and
- an impedance adjustment capacitor connected in parallel to said choke coil for adjusting an impedance between said one end of said choke coil and said variable capacitance diode;
- an oscillation transistor having a base connected to said resonance circuit;
- and
- a capacitor which interconnects the base and emitter of the transistor, and a capacitor which connects the emitter of the transistor to ground, thereby forming a Colpitts oscillator.
4 more elements
Dependencies are inferred from the claim text.