Lecture 15

Lecture 15 - Lecture 15 Lecture 15 Charge coupled device...

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Lecture 15 1 © Jeffrey Bokor, 2000, all rights reserved Lecture 15 Charge coupled device (CCD) The basic CCD is composed of a linear array of MOS capacitors. It functions as an analog memory and shift register. The operation is indicated in the diagram below: In the fashion indicated, charge is transferred down the line. In the modern CCD image sensor, there is one such CCD transfer line for each column of the array. During the image exposure, one phase in each column is biased in deep depletion. Light passes through the gate electrodes, which are made thin enough so that most of the light creates electron-hole pairs in the substrate, which are then collected under the gates. To read out the array, each column is clocked down by one. At the bottom, there is one extra CCD line oriented in the horizontal direction. The columns deposit their charge in this horizontal array, which then clocks out to a charge sensitive amplifier and then off-chip. In turn, the array is read out one line at a time in this fashion.
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Lecture 15 - Lecture 15 Lecture 15 Charge coupled device...

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