发明名称 |
LOCAL OSCILLATION APPARATUS |
摘要 |
A local oscillation apparatus employing a dielectric coaxial resonator (27) which is used as a fixed local oscillation circuit for a tuner of the double super system and for a converter for CATV; wherein the center conductor of the dielectric coaxial resonator (27) is connected to an end of a variable-capacity diode (23) via a capacity (25), the other end of the diode being grounded in an AC manner, an AFC voltage being applied from an output terminal (E) of a frequency control circuit to the variable-capacity diode (23) via a resistor (35), and a first reference potential (VA) which is smaller than the power source voltage (VCC) by a predetermined potential drop being also applied thereto; wherein one end of the variable-capacity diode (23) is connected to the power source voltage (VCC) via a second resistor (22); and wherein even when the power source voltage (VCC) undergoes the change, the voltage does not change across both terminals of the variable-capacity diode (23) to prevent the oscillation frequency from changing. |
申请公布号 |
WO8707991(A1) |
申请公布日期 |
1987.12.30 |
申请号 |
WO1987JP00397 |
申请日期 |
1987.06.18 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
IKUHARA, HIDEYUKI;USUI, AKIRA;KUBO, KAZUHIKO;NAGAI, HIROYUKI;KUTSUKI, TETSUO |
分类号 |
H03B1/00;H03B5/18;H03D7/00;H03J7/02;H03J7/08;(IPC1-7):H03J7/02;H03L7/02;H03B5/04 |
主分类号 |
H03B1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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