Circuit for automatically adjusting the rate of change of amplit

Details Circuit for automatically adjusting the rate of change of amplit Circuit for automatically adjusting the rate of change of amplit

1988-10-07

1992-06-02

Eisenzopf, Reinhard J.

Telecommunications

Transmitter

Carrier amplitude control

455127, 358186, 330 44, H04B 104, H04N 538, H03F 354

Patent

active

051195062

ABSTRACT:
A linearity correction circuit for television transmission operates at intermediate frequency to introduce appropriate pre-distortion into the amplitude envelope to compensate for non-linearity in the power amplifier states. An array of parallel current sources (11), each of which is independently adjustable in response to the perceived requirement for pre-distortion over a corresponding amplitude band, to inject a current sufficient to introduce an appropriate differential voltage at the output. The circuit provides for the independent correction of each amplitude band, so that it is capable of operation under microprocessor control in real time.

REFERENCES:
patent: 3277318 (1966-10-01), Bedford
patent: 4227216 (1980-10-01), Blom
patent: 4392252 (1983-07-01), Cluniat
patent: 4470068 (1984-09-01), Plume
patent: 4670789 (1987-06-01), Plume
patent: 4905086 (1990-02-01), Tahara
"Adaptive Contrast Corrector Using Real-Time Histogram Modification", Favreau et al SMPTE Journal May 1984.

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