Tuner circuit and digital broadcast receiver with the same

Details Tuner circuit and digital broadcast receiver with the same Tuner circuit and digital broadcast receiver with the same

2005-11-07

2008-09-30

Nguyen, Tony T (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Plural receivers

C455S234100, C455S245100

Reexamination Certificate

active

07430404

ABSTRACT:
A tuner circuit according to the invention includes two AGC control units supplying AGC voltages V1and V2to an AGC amplifier, respectively. When the AGC voltage V1is higher the AGC voltage V2, a voltage on a cathode of a diode becomes high, and the diode11is turned off. When the AGC voltage V2is higher than the AGC voltage V1, a voltage on an anode of the diode becomes high, and the diode11is tuned on. Therefore, in the case of an ordinary signal level, the AGC voltages establish a relationship of, and the AGC voltage V2performs the control. When an excessively large disturbing signal is input, the AGC control unit controls the AGC amplifier to suppress deterioration of performance.

REFERENCES:
patent: 6650878 (2003-11-01), Abe et al.
patent: 6-153100 (1994-05-01), None

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