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1.发明授权Linearity correction circuit employing fet at input of differential operational amplifier 失效线性校正电路采用不同运算放大器输入的FET
公开(公告)号：US3584233A
公开(公告)日：1971-06-08
申请号：US3584233D
申请日：1968-11-21
Applicant: PHILIPS CORP
Inventor： CATH PIETER G , WILLIAMS ROBIN
CPC classification number: H04N5/202
Abstract: A gamma correction circuit, to compensate for nonlinear video display tube characteristics, is provided with a field effect transistor operating with the gate electrode thereof forward biased to generate a compensation characteristic, an operational amplifier for subtracting the compensation characteristic from the nonlinear tube characteristic, and a load for developing the compensated signal. In a specific embodiment, the compensation characteristic is generated, and the linear portion of the uncorrected signal subtracted therefrom, to develop a correctional curve with zero end-points. The gain of the curve is adjusted by varying the circuit gain, and the linear function reinserted to obtain the desired function.
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