Dual threshold wide band/narrow band AGC

Details Dual threshold wide band/narrow band AGC Dual threshold wide band/narrow band AGC

1981-12-21

1984-06-19

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455155, 455246, 455253, 330257, 330254, H04B 116, H03F 345

Patent

active

044556810

ABSTRACT:
A radio receiver incorporates an AGC system having an upper wide band threshold and a narrow band threshold. Both thresholds are made temperature independent. The narrow band threshold is related to the circuit response to tuning meter voltage and the wide band threshold is related to the tuner output prior to i-f selectivity. When these responses are logically anded, an AGC response having the desirable characteristics of both narrow band and wide band systems is achieved. An IC form of AGC circuit is disclosed.

REFERENCES:
patent: 3673499 (1972-06-01), Avins
patent: 3821649 (1974-06-01), Grosjean
patent: 4186351 (1980-01-01), Brefini et al.
patent: 4219778 (1980-08-01), Ishii
patent: 4339728 (1982-07-01), Monticelli

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