Friday, April 20, 2007

The simple experiment for prolonging the cable of our CMOS image sensor

To Peter Alfke, Symon and John Larkin: Thank you for your help. We had design a PCB board to test the method you told us and we could get it next Tuesday (April, 24th). What' more, we do a simple experiment to have a simple qualitative analysis. The conclusion is fairly positive. Thank you! If we have further information, we will also tell you.

1, The original waveform of PCLK (3.3v/24MHz) output pin:







2, A resistance of approximately 56Ω(three resistors in serial) is used as source terminator and a 1 meter long normal cable is used as transmission line. The following figure is the waveform on the far end of the cable.





3, Ditto. Waveform on the series-termination resistor. The magnitude really drops because of the reflection.

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