Canon XRD9827REF user manual Reference DC Standard Deviation

... the analog plusTM compa

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PRELIMINARY

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.

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