| 摘要 |
PROBLEM TO BE SOLVED: To provide a television tuner device capable of receiving terrestrial analog, digital broadcasting, and satellite broadcasting, to reduce any influence to be given from a noise to be emitted from a certain integrated circuit to components connected to another circuit, and to reduce the influence of heat generation between integrated circuits. SOLUTION: The substrate surface and back face of a multi-layer substrate 5 are divided into four sections M1 to M4 by a shield board 6, and a tuner IC1 for terrestrial analog and digital broadcasting reception, a tuner IC2 for satellite digital broadcasting reception, an IC 3 for digital broadcasting signal demodulation, and an IC 4 for analog broadcast signal demodulation are loaded with such layout that they are not affected by their mutual heat radiation. Furthermore, a hollow core coil 11c which is mostly affected by any noise signal to be radiated from the IC3 for digital broadcast signal demodulation is loaded on the substrate back side at the opposite side of the substrate surface on which the IC3 for digital broadcast signal demodulation is loaded, and at least the surrounding of the hollow core coil 11c is surrounded by the shield board 6 so as to be sealed. COPYRIGHT: (C)2009,JPO&INPIT
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