Tuner circuit and digital broadcast receiver with low...

Details Tuner circuit and digital broadcast receiver with low... Tuner circuit and digital broadcast receiver with low...

2011-06-07

2011-06-07

Harold, Jefferey (Department: 2422)

Television

Receiver circuitry

C348S731000, C348S729000, C348S726000

Reexamination Certificate

active

07956933

ABSTRACT:
In a tuner circuit, an automatic gain control circuit generates an RF-AGC voltage for automatically controlling a gain of an RF-AGC amplifier in accordance with a level of a signal output from an IF amplifier. An emitter follower circuit includes a transistor for current amplification, and varies a drive current of the transistor in accordance with the RF-AGC voltage. Thus, when an interference signal is at a high level, the drive current of the transistor becomes large. Therefore, distortion performance of the emitter follower circuit is improved. On the other hand, in a normal state where the interference signal is at a low level, the drive current of the transistor fails to become large. Therefore, low power consumption is achieved.

REFERENCES:
patent: 5203019 (1993-04-01), Rinderle
patent: 6628343 (2003-09-01), Yamaguchi et al.
patent: 7330707 (2008-02-01), Okanobu
patent: 62-231525 (1987-10-01), None
patent: 6-153100 (1994-05-01), None
patent: 2001-36354 (2001-02-01), None

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