Tuner circuit

Details Tuner circuit Tuner circuit

2005-12-20

2005-12-20

Nguyen, Khanh V. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including frequency-responsive means in the signal...

C330S300000, C348S731000

Reexamination Certificate

active

06977555

ABSTRACT:
A tuner circuit includes a variable attenuator circuit including a PIN diode, disposed upstream of a variable-gain amplifier circuit and controlled according to the same AGC voltage used to control the variable-gain amplifier circuit. The operations of the variable-gain amplifier circuit and the variable attenuator circuit in relation to the AGC voltage are set such that when an input RF signal is at a maximum assumed level, a direct current that flows through the PIN diode will be less than a value of a direct current that maximizes intermodulation distortion.

REFERENCES:
patent: 4019160 (1977-04-01), Kam
patent: 4369414 (1983-01-01), Aoki et al.
patent: 4668882 (1987-05-01), Matsuura
patent: 6037999 (2000-03-01), Kunishima
patent: 6081151 (2000-06-01), Boulic
patent: 10-276109 (1998-10-01), None

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