Preliminary, The analog plus compa – Canon XRD9827REF User Manual
Page 16
... the analog plus compa
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PRELIMINARY
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Figure 13. Gray-scale Target Scan
22. To demonstrate the noise component is contributed from the CIS, we hooked up a DC reference to the
scanner and the results are shown below in Table 1.
REFERENCE DC (V)
STANDARD DEVIATION
SYSTEM SNR (dB) W/O CIS
NOISE COMPONENT
2.0 2.144328
62.6117
2.5 3.48261
58.3988
3.0 2.399188
61.6356
3.5 1.983461
63.28842
Table 1. Signal-to-Noise Ratio of the XRD9827REF with DC Source as Input (No CIS Noise
Component)
As we can see from Table 1, the SNR falls into the range of 58 dB to 63 dB when a DC reference is used
as input to the XRD9827REF. The system alone gives a 9 1/2 to 10 bit performance. The largest noise
source we saw in previous scans came from the CIS. A typical plot of the DC reference is shown in Figure
14.