Automatic gain control circuit for radio communication apparatus

Details Automatic gain control circuit for radio communication apparatus Automatic gain control circuit for radio communication apparatus

1993-05-24

1997-05-13

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455266, 455339, 375345, H04B 110

Patent

active

056302207

ABSTRACT:
A radio communication apparatus having a reception system having an automatic gain control circuit, which includes a first band-pass filter with a wide band inserted into a signal supplying passage to a digital demodulator located in the subsequent stage of a variable gain type intermediate frequency amplifier. The automatic gain control circuit further includes a second band-pass filter with a narrow-band set narrower than that of the first band-pass filter, inserted in a circuit that forms an automatic gain control (AGC) loop. Received analog signals are modulated and subjected to digital demodulation by the digital demodulator after passing through the first band-pass filter. Received intermediate-frequency signals which have passed through the second band-pass filter are supplied to a detector provided in the AGC loop. A gain control signal corresponding to the difference between the signal level value detected by the detector and a predetermined reference value is generated from an error amplifier, and is looped back to the intermediate frequency amplifier to control the gain thereof.

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