Television tuner intermediate-frequency circuit that hardly...

Details Television tuner intermediate-frequency circuit that hardly... Television tuner intermediate-frequency circuit that hardly...

2005-04-05

2005-04-05

Harvey, David E. (Department: 2614)

Television

Receiver circuitry

Tuning

C348S725000

Reexamination Certificate

active

06876402

ABSTRACT:
1. The object of the invention is to configure so that a video intermediate-frequency signal and a voice intermediate-frequency signal respectively included in an adjacent channel can be damped without having an effect upon a tuning characteristic of an intermediate frequency tuning circuit.2. To achieve the object, an integrated circuit including a balanced type mixer provided with a first output terminal and a second output terminal as well as a balanced type intermediate-frequency amplifier provided with a first input terminal and a second input terminal is provided, the first output terminal and the first input terminal as well as the second output terminal and the second input terminal are respectively connected via a first capacitative element formed in the integrated circuit, a first external terminal connected to the first output terminal, a second external terminal connected to the second output terminal and a third external terminal connected to the first input terminal are provided to the integrated circuit, an intermediate frequency tuning circuit is connected between the first external terminal and the second external terminal, and the first external terminal and the third external terminal are connected via an inductance element.

REFERENCES:
patent: 6583826 (2003-06-01), Sawamoto et al.
patent: 2001-196961 (2001-07-01), None

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