Input signal level control device for receiver

Details Input signal level control device for receiver Input signal level control device for receiver

1981-05-14

1983-07-12

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455249, 455253, 330280, 330284, H04B 116, H03G 330

Patent

active

043935133

ABSTRACT:
An input signal level control device for a receiver particularly adapted for use in a mobile FM receiver in which the received electric field strength changes abruptly and greatly. An attenuating device such as a switching diode is coupled to an input of a high frequency amplifier to which the input received signal is fed. The attenuating device switches on when the received electric field strength reaches the first predetermined value. As the electric field strength continues to increase and reaches a second value greater than the first, a control circuit controls the gain of the high frequency amplifier in accordance with the electric field strength.

REFERENCES:
patent: 3431506 (1969-03-01), Hirshfield et al.
patent: 3490046 (1970-01-01), Russell
patent: 4057765 (1977-11-01), Schuermann
patent: 4147991 (1979-04-01), Ijichi et al.

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