Japanese Patent JPH052001

B2

PCT No. PCT/JP86/00358 Sec. 371 Date Mar. 20, 1987 Sec. 102(e) Date Mar. 20, 1987 PCT Filed Jul. 14, 1986 PCT Pub. No. WO87/00706 PCT Pub. Date Jan. 29, 1987.The present invention relates to a local oscillation apparatus which is used as a local oscillator of a communication apparatus or as a fixed local oscillator of a tuner. The present invention comprises a coaxial resonator (1) and an amplifying circuit (26) having an output end connected to a central conductive member of the coaxial resonator (1) through a first capacitor (2), an input end connected to the central conductive member through a second capacitor (3), and a variable capacitance diode (5) having one end connected to the central conductive member of the coaxial resonator (1) through a third capacitor (4) and the other end grounded so as to permit an alternating current only to be flowed. The circuit is characterized by such a constitution that an oscillation frequency is varied by a voltage applied to the variable capacitance diode (5), a cause of temperature drift of an oscillation frequency can be almost eliminated, and a stable oscillation can be accomplished by only compensation of the temperature characteristics of the coaxial resonator (1).

KUBO KAZUHIKO
USUI AKIRA
NAGAI HIROYUKI

JP16139685A

January 11, 1993

July 22, 1985

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MATSUSHITA ELECTRIC IND CO LTD

H03B5/18; H03B5/12; H03L1/02; H03B1/00

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