Television tuner for both analog and digital signal

Details Television tuner for both analog and digital signal Television tuner for both analog and digital signal

2007-06-19

2007-06-19

Hsia, Sherrie (Department: 2622)

Television

Receiver circuitry

Tuning

Reexamination Certificate

active

10924164

ABSTRACT:
The intermediate frequency signal based on the analog television signal and the intermediate frequency signal based on the digital television signal can be supplied to the intermediate frequency circuit without being distorted and with characteristics needed to the transfer of the analog television signal and the digital television signal. The television tuner contains a first SAW filter29ato which a first intermediate frequency signal is input, a second SAW filter30ato which a second intermediate frequency signal is input, a distributor25inserted between the intermediate frequency amplifier22and the first and second SAW filters29aand30a. The input port of the distributor25is connected to the ground by a reactance element26, and the reactance value of the reactance element25is switched so as to have a conjugation relationship with the reactance component of the respective input impedance of the first and second SAW filters29aand30a.

REFERENCES:
patent: 6016170 (2000-01-01), Takayama et al.
patent: 7123309 (2006-10-01), Yoda
patent: 2001-111905 (2001-04-01), None
patent: 2004-056194 (2004-02-01), None

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