Circuit for preventing output clipping of R.F. stage in radio re

Details Circuit for preventing output clipping of R.F. stage in radio re Circuit for preventing output clipping of R.F. stage in radio re

1975-09-29

1977-06-14

Safourek, Benedict V.

325319, 325405, H04B 116

Patent

active

040300358

ABSTRACT:
In a receiver comprising a radio frequency amplifier stage, a frequency converter stage, an intermediate frequency amplifier stage and a detector, so that the gains of the radio frequency amplifier stage and the intermediate frequency amplifier stage are automatically controlled by an AGC voltage derived from the detector, the improvement further comprising a voltage comparator which compares a signal amplitude value of the radio frequency amplifier stage and a predetermined reference value and which provides a detection output signal when the former value becomes greater than the latter value, the gain of the radio frequency amplifier stage being reduced by the detection output signal so as to prevent the output clipping of the radio frequency amplifier stage.

REFERENCES:
patent: 2897353 (1959-07-01), Schweiss
patent: 3089087 (1963-05-01), Birkenes
patent: 3233177 (1966-02-01), Stone
patent: 3600684 (1971-08-01), Cherry
patent: 3895299 (1975-07-01), Tiedeman, Jr.

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