Receiver and transmitter-receiver having variable attenuator to

Details Receiver and transmitter-receiver having variable attenuator to Receiver and transmitter-receiver having variable attenuator to

1997-03-20

1999-10-26

Hsu, Alpus H.

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

370347, 4552491, 4552501, H04B 7212, H04J 300

Patent

active

059740400

ABSTRACT:
There are provided a receiver and a transmitter-receiver in which an automatic gain control loop is promptly performed and even in the case of a modulated wave having information in its amplitude, wave distortion can be eliminated. A received signal is received by an antenna and is amplified by a power amplifier. The gain of the received signal is attenuated by a variable attenuator in accordance with an output voltage of a holding circuit. After the signal is converted to an intermediate-frequency signal and amplified through a common procedure and detected, a comparator compares an output signal of the detector and a reference voltage V.sub.ref, and obtains a signal indicating whether the output signal exceeds a reference voltage or a differential voltage therebetween. When the output signal or the differential voltage is brought to a positive level, a timing signal generating section generates a timing signal T.sub.m, and the holding circuit holds a detection signal. In the variable attenuator, the signal is attenuated in accordance with the detection signal. Thereafter, output of the detector is integrated in a time constant circuit, and addition of respective outputs of the time constant circuit and the holding circuit is performed in a computing unit.

REFERENCES:
patent: 5630220 (1997-05-01), Yano

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