Radio transceiver capable of avoiding intermodulation distortion

Details Radio transceiver capable of avoiding intermodulation distortion Radio transceiver capable of avoiding intermodulation distortion

1992-03-24

1995-06-27

Urban, Edward F.

Telecommunications

Transmitter and receiver at same station

With transmitter-receiver switching or interaction prevention

4551831, 4552001, 4552461, 455311, H04B 140

Patent

active

054288240

ABSTRACT:
A radio transceiver comprises an RF amplifier and a first frequency mixer which converts an amplified RF signal into a first IF signal and whose output may include intermodulation distortion. A second frequency mixer converts the output of first frequency mixer into a second IF signal. An interference detector detects the intermodulation distortion by seeing if a beat is included in the second IF signal. Upon detection of intermodulation distortion, a controller minimizes a gain of RF amplifier to decrease or eliminate the intermodulation distortion. Responsive to the end of conversation, the controller maximizes the gain of RF amplifier to increase the reception sensitivity. The controller may periodically maximize the RF amplifier gain after the detection of the intermodulation distortion. If no intermodulation distortion is detected during this gain-maximized period, the controller keeps the gain to be a maximized value. If the intermodulation distortion is not decreased or eliminated even though the RF amplifier gain is minimized, the controller may change a used frequency to another frequency.

REFERENCES:
patent: 3428900 (1969-02-01), Newton
patent: 3729681 (1973-04-01), Elder
patent: 4052673 (1977-10-01), Herzog
patent: 4355414 (1982-10-01), Inoue
patent: 4654884 (1987-03-01), Sakai et al.
patent: 4955077 (1990-09-01), Sugayama

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