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TC255P Folha de dados(PDF) 6 Page - Texas Instruments |
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TC255P Folha de dados(HTML) 6 Page - Texas Instruments |
6 / 18 page TC255P 336- × 244-PIXEL CCD IMAGE SENSOR SOCS057A – JUNE 1996 – REVISED MARCH 2003 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 charge-detection node and output amplifier The buffer amplifier converts charge into a video signal. Figure 4 shows the circuit diagram of the charge-detection node and output amplifier. As charge is transferred into the detection node, the potential of this node changes in proportion to the amount of signal received. This change is sensed by an MOS transistor and, after proper buffering, the signal is supplied to the output terminal of the image sensor. After the potential change is sensed, the node is reset to a reference voltage supplied by an on-chip reference generator. The reset is accomplished by a reset gate that is connected internally to the serial register. The detection node and buffer amplifier are located a short distance from the edge of the storage area; therefore, two dummy cells are used to span this distance. Reference Generator Q0 Q1 Q2 Q3 Q5 Q6 VO Q4 QR SRG Detection Node ADB Figure 4. Buffer Amplifier and Charge-Detection Node |
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