Wideband linear video contrast control

Details Wideband linear video contrast control Wideband linear video contrast control

1980-02-19

1981-03-17

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 520

Patent

active

042570646

ABSTRACT:
The nonlinearity between the gate voltage of a first field effect transistor and its source-to-drain impedance is compensated for by a feedback differential amplifier circuit using a reference field effect transistor identical to the first field effect transistor. Linear control is exercised through a potentiometer controlling the voltage on the first of two inputs to the differential amplifier. The other input of the differential amplifier senses the voltage drop across the source and drain of the reference transistor. The output of the differential amplifier is applied to the first transistor gate and as feedback to the reference transistor gate.

REFERENCES:
patent: 3240874 (1966-03-01), Schreiner
patent: 3804981 (1974-04-01), Avins
patent: 3969579 (1976-07-01), Logan et al.
patent: 4013975 (1977-03-01), Kataoka et al.
patent: 4125789 (1978-11-01), Van Schoiack

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