Automatic gain controlling mechanism of radio frequency amplifie

Details Automatic gain controlling mechanism of radio frequency amplifie Automatic gain controlling mechanism of radio frequency amplifie

1996-07-17

1998-05-26

Mullen, Thomas

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455293, H04B 106

Patent

active

057582726

ABSTRACT:
An automatic gain controlling mechanism of radio frequency amplifier for a glass antenna in a car audio system includes a radio frequency amplifier, an FM front end part used as a tuner, an FM detector/multiplexer, a volume controller and a voltage amplifier. The radio frequency amplifier is gain-variable. A microprocessor is connected to a voltage level output terminal of the FM detector/multiplexer at the data input terminal for receiving a voltage level signal detected by the FM detector/multiplexer and determining an intensity of an electric field intensity. The microprocessor is also connected to a gain variable terminal of the RF amplifier at the output terminal for transmitting a gain controlling signal to the RF amplifier. Thus, the increase or decrease of the gain of the radio frequency amplifier is automatically controlled.

REFERENCES:
patent: 5428830 (1995-06-01), Zerod et al.

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