Tuner zum Empfang von Fernsehsignalen im VHF- und UHF-Band

Tuner for receiving television signal in VHF band and UHF band

Circuit d'accord pour la réception de signaux de télévision dans les bandes VHF et UHF

Abstract

In a television tuner, a predetermined bias voltage is applied to the anode of a first switching diode (3). A power supply voltage is applied to the collector of a switching transistor (6) via a power supply resistor (7), and the emitter of the switching transistor is grounded. The collector of the switching transistor is connected to an input terminal of a first FET (12) via a first resistor (16). The first switching diode and the switching transistor are both switched on or off correspondingly to whether a television signal in the UHF band is to be received or a television signal in the VHF band is to be received.

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Patent Citations (3)

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    DE-19819544-A1November 11, 1999Siemens AgSchaltungsanordnung zur Bereichsumschaltung in Hochfrequenzempfängern
    EP-0457932-A1November 27, 1991Siemens AktiengesellschaftSchaltungsanordnung zur Bereichsumschaltung in Tunern
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NO-Patent Citations (0)

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Cited By (3)

    Publication numberPublication dateAssigneeTitle
    EP-1355422-A2October 22, 2003Alps Electric Co., Ltd.Eingangsschaltung eines Fernsehtuners
    EP-1355422-A3July 21, 2004Alps Electric Co., Ltd.Circuit d'entrée d'un circuit d'accord pour récepteur de télévision
    US-7139039-B2November 21, 2006Alps Electric Co., Ltd.Input circuit of television tuner