Double-tuning circuit of television tuner
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United States of America Patent
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-
Dec 14, 2010
Grant Date -
Jul 2, 2009
app pub date -
Oct 24, 2008
filing date -
Dec 28, 2007
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a double-tuning circuit including a primary tuning circuit having a first inductor and a first variable capacitive element connected in parallel and a secondary tuning circuit having a second inductor and a second variable capacitive element connected in parallel, a fixed part of a copper-foil pattern is connected to a connection point at which the double-tuning circuit is connected to an input terminal of a frequency mixing circuit, and a tip part of the copper-foil pattern extends to near the first inductor, whereby a trap circuit for attenuating an image frequency component is formed. A pattern is formed between a ground-side terminal of the first inductor and the ground, and a capacitor is connected between a connection point at which the first inductor is connected to one terminal of the pattern and a ground-side terminal of the second variable capacitive element.
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