High-frequency signal transmission apparatus and electronic...

Details High-frequency signal transmission apparatus and electronic... High-frequency signal transmission apparatus and electronic...

2005-09-13

2005-09-13

Vuong, Quochien B. (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

C455S323000, C455S326000, C348S729000, C725S079000

Reexamination Certificate

active

06944431

ABSTRACT:
An electronic tuner has an input terminal, a mixer receiving the signal fed into the input terminal, a matching circuit connected to an output of the mixer, a band-pass filter connected to an output of this matching circuit, an intermediate-frequency (IF) amplifier connected to an output of the band-pass filter, and an output terminal receiving output of the IF amplifier. These circuits are composed of balanced circuits and connected by balanced lines. The mixer has a high output impedance. For the matching circuit, the impedance of the matching circuit at the band-pass filter side is equal to the impedance of the band-pass filter at the matching circuit side. This structure can realize an electronic tuner having low power consumption.

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patent: 0 751 616 (1997-01-01), None
patent: 1 024 590 (2000-08-01), None

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