Receiver with an AGC circuit capable of expanding a dynamic rang

Details Receiver with an AGC circuit capable of expanding a dynamic rang Receiver with an AGC circuit capable of expanding a dynamic rang

1995-06-01

1996-04-09

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

4552491, 4552501, 330138, 375345, H04B 106

Patent

active

055070230

ABSTRACT:
A receiver comprises an AGC circuit including a low noise amplifier for amplifying a reception input signal and an AGC amplifier, a level detection circuit for producing a strength indication signal indicative of an input field strength, and a demodulator. The receiver has a function of controlling a gain to keep an amplitude of a demodulator input signal at a constant level. A bias control circuit controls on and off of a bias voltage source to allow and inhibit supply of a bias voltage to the low noise amplifier when the strength indication signal has a signal level lower than and not lower than a first threshold level, respectively. When the signal level is thereafter decreased to a second threshold level lower than the first threshold level, the bias control circuit turns on the bias voltage source to supply the bias voltage. A level output circuit serves to keep the strength indication signal at a predetermined high level when the bias voltage source is turned off.

REFERENCES:
patent: 4227256 (1980-10-01), O'Keefe
patent: 4455681 (1984-06-01), Wile
patent: 4581589 (1986-04-01), Ikoma
patent: 4742565 (1988-05-01), Iwahashi
patent: 4745365 (1988-05-01), Ugenti
patent: 5184349 (1993-02-01), Riordan
patent: 5303268 (1994-04-01), Tsutsumi et al.
Patent Abstracts of Japan, vol. 15, No. 9 (E-1021) Jan. 9, 1991 & JP-A-02 261 223 (NEC Corp.) Oct. 24, 1990 Abstract.
Patent Abstracts of Japan, vol. 15, No. 86 (E-1039) Feb. 28, 1991 & JP-A-02-301 209 (NEC Corp.) Dec. 13, 1990--Abstract.

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