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US 5,982,244 AGranted
High-frequency voltage controlled oscillator
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorHirotaka Fujisaki
Life of this patent
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Abstract
A voltage controlled oscillator provides a trimming stub (3) for adjusting a free-running frequency in parallel to a microstrip line resonator (4). This arrangement makes it possible to easily perform fine adjustment of a free-running frequency used in the voltage controlled oscillator capable of supplying 2 GHz or higher oscillating frequency.
Claims4
A high-frequency voltage controlled oscillator comprising:
- a capacitance circuit comprising a voltage controlled variable capacitance element, a fixed capacitance element and means for applying a control voltage to said voltage controlled variable capacitance element;
- a microstrip line serving as a resonator, said microstrip line having a first end connected to said capacitance circuit and a second end connected to ground;
- and
- a trimming stub for adjusting a free-running frequency, said trimming stub being provided in parallel with said microstrip line so that an oscillation frequency of said high-frequency voltage controlled oscillator is controlled in accordance with said control voltage and said free-running frequency is finely adjusted by using said trimming stub to change an inductance of said microstrip line.
1 more element
Dependencies are inferred from the claim text.