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12. 发明授权

US3969634A Bucket background subtraction circuit for charge-coupled devices 失效
标题翻译：电荷耦合器件的斗背景减法电路
公开(公告)号：US3969634A
公开(公告)日：1976-07-13
申请号：US601124
申请日：1975-07-31
申请人： Stephen C. Su , Ronald M. Finnila
发明人： Stephen C. Su , Ronald M. Finnila
IPC分类号： G11C19/28 , H01L27/148 , H01L29/768 , H04N5/357 , H04N5/372 , H01L29/78
CPC分类号： H01L27/14881 , G11C19/285 , H01L27/14856 , H01L29/76808 , H04N3/1568
摘要： There is disclosed a circuit for removing the DC or background representing charge component of a signal to be passed through a charge coupled device shift register without degrading the information carried by the AC component of the signal. Such a circuit may, for example, be used to remove the constant background illumination component of the input from a semiconductor imaging device to increase the contrast ratio of the image signal. The circuit comprises two electrode defined potential wells or buckets formed in a semiconductor substrate with a control gate between them and a transfer gate which controls the flow of the charges in the first bucket to a P-N junction. Like the well defining electrodes, the control gate and transfer gate are electrodes separated from the semiconductor substrate by an insulation layer. The transfer gate functions as a channel switch to control the flow of the background charges from the first bucket through the P-N junction to an external drain in discrete quantized increments under the control of an appropriate clock voltage on the transfer electrode. This subtraction of the DC component from the signal passing through the shift register results in a reduction in the size of the storage electrodes required to transmit a given quantity of signal charge through the shift register for fixed clock voltages and thereby makes more economical use of the chip area.
摘要翻译：公开了一种用于去除表示要通过电荷耦合器件移位寄存器的信号的电荷分量的DC或背景的电路，而不会降低由信号的AC分量携带的信息。这样的电路可以例如用于从半导体成像装置中去除输入的恒定背景照明分量，以增加图像信号的对比度。该电路包括形成在半导体衬底中的两个电极限定的势阱或桶，其间具有控制栅极和控制第一桶中的电荷流到P-N结的传输门。与阱定义电极一样，控制栅极和转移栅极是通过绝缘层与半导体衬底分离的电极。传输门用作通道开关，以在转移电极上的适当的时钟电压的控制下以离散的量化增量来控制背景电荷从第一个桶通过P-N结到外部漏极的流动。从通过移位寄存器的信号中减去DC分量导致通过用于固定时钟电压的移位寄存器传输给定量的信号电荷所需的存储电极的尺寸减小，从而更经济地使用芯片面积。

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