TV tuners and methods thereof

Details TV tuners and methods thereof TV tuners and methods thereof

2008-01-01

2008-01-01

Hsia, Sherrie (Department: 2622)

Television

Receiver circuitry

Tuning

C348S726000

Reexamination Certificate

active

07315333

ABSTRACT:
TV tuners and methods thereof are provided. A TV tuner includes a first frequency converting circuit, a second frequency converting circuit, and a demodulator. The first frequency converting circuit, switchable between a first operating mode and a second operating mode, receives an RF signal and outputs a converted signal by performing high-side injection on the RF signal in the first operating mode and performing frequency addition on the RF signal in the second operating mode. The second frequency converting circuit performs a down conversion on the converted signal from the first frequency converting circuit to obtain an intermediate frequency signal. The demodulator demodulates the intermediate frequency signal and outputs a baseband frequency signal comprising video and audio signals.

REFERENCES:
patent: 5737035 (1998-04-01), Rotzoll
patent: 6438361 (2002-08-01), Chong et al.

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