Digital television receiver with automatic gain control unit...

Details Digital television receiver with automatic gain control unit... Digital television receiver with automatic gain control unit...

2007-09-18

2007-09-18

Lee, Michael H. (Department: 2622)

Television

Receiver circuitry

C375S345000, C455S234100, C455S239100, C455S240100

Reexamination Certificate

active

10659591

ABSTRACT:
An automatic gain controller (AGC) and method for use in a digital TV receiver having an IF amplifier, an RF amplifier, an analog to digital converter (ADC) connected to the IF amplifier, and a demodulator connected to the ADC, the AGC comprising: an input selector for selecting as feedback signal one of a digitized IF signal output of the ADC and a demodulated signal output of the demodulator; a signal detection unit for detecting the conditions of the feedback signal and outputting status signals; and a traffic controller for receiving the status signals and outputting control signals based on the status signals to an IF gain controller and an RF gain controller for independent gain control of the RF amplifier and the IF amplifier. The AGC and method further including hysteresis-curve-based switching for alternatively halting adjustments to IF gain while adjusting RF gain or halting adjustments to RF gain while adjusting IF gain.

REFERENCES:
patent: 4989074 (1991-01-01), Matsumoto
patent: 5204977 (1993-04-01), Feldt
patent: 6044253 (2000-03-01), Tsumura
patent: 6771719 (2004-08-01), Koyama et al.
patent: 6996386 (2006-02-01), Yamanaka
patent: 7046976 (2006-05-01), Le Naour et al.
patent: 7076224 (2006-07-01), Giry-Cassan et al.

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