Title:
VOLTAGE CONTROLLED OSCILLATOR
Document Type and Number:
Japanese Patent JP3221579
Kind Code:
B2
Abstract:
PURPOSE: To improve the frequency temperature characteristic of a voltage controlled oscillator employing an oscillating element having a large frequency temperature coefficient.
CONSTITUTION: A capacitive reactance circuit 5 for temperature compensation provided with a varactor diode 51 is connected in parallel with a reactance circuit 1 for frequency control connecting to an oscillating element 2. Then a static capacitance of the varactor diode 51 is changed by giving a temperature control voltage VT to cancel a change in the characteristic of the oscillating element 2 due to a temperature of an equivalent inductance to the capacitive reactance circuit 5.
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Inventors:
Hiroki Suzuki
Application Number:
JP23520492A
Publication Date:
October 22, 2001
Filing Date:
August 12, 1992
Export Citation:
Assignee:
Hitachi Kokusai Electric Co., Ltd.
International Classes:
H03B5/04; H03L1/02; H03L7/099; H03L7/12; (IPC1-7): H03L1/02; H03B5/04; H03L7/099; H03L7/12
Domestic Patent References:
| JP53144242A | ||||
| JP4259103A | ||||
| JP3126303A | ||||
| JP338934U |
Attorney, Agent or Firm:
Manabu Otsuka