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KAF-4320-AAA-JP-B2 Datasheet(PDF) 11 Page - ON Semiconductor |
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KAF-4320-AAA-JP-B2 Datasheet(HTML) 11 Page - ON Semiconductor |
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11 / 25 page  KAF−4320 www.onsemi.com 11 Noise The CCD amplifier noise floor, the CCD dark current during readout, and other system components such as the analog-digital converter dictate the total system noise. CCD Amplifier The noise contributed by the output amplifier is determined from the amplifier’s noise power spectrum, the system bandwidth, and any other analog processing. Correlated double sampling is a standard analog processing technique used with CCDs and it is assumed that it is used for all of the rest of the calculations and results in this document. System Noise The total noise will be the combination of the CCD noise and the noise contributed by other components in the processing circuitry. The total noise, dominated by the CCD and the A/D converter is also shown in Figure 11. The measured vales were obtained using a system that employed Datel 16 bit analog to digital converters, the ADS931 and ADS933. The system noise obtained matched the Datel specifications exactly and was similar and slightly lower than the CCD noise contribution. The table below shows the results and good agreement between the expected and measured results for the CCD alone and the CCD in the system at 1 MHz and 3 MHz. The values in the table are in electrons referred to the CCD amplifier input. Table 6. Frequency CCD Measured Noise CCD + System Datel ADS93x Measured 1.00E+06 12 16.2 3.00E+06 17.3 22.6 Temperature Dependance of the Noise Floor The temperature dependence of the noise floor is dictated primarily by the dark current generated during the readout time for the CCD. Figure 12 and Figure 13 show the expected dynamic range as a function of temperature for two pixel rates, 3 MHz and 1 MHz. The dynamic range was calculated using the measured amplifier and system noise values, the expected dark current performance, and the saturation signal. At 25 °C, the dark current shot noise can contribute from 12 to 50 electrons and dominate the noise floor. The maximum dynamic range can be achieved at temperatures < −10 °C for these read out frequencies. |
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