Abstract
he method and the scheme of measuring stand are proposed for the fast control of the parameters of spectrometric analog-to-digital converters and other elements of the spectrometric channel. Within a few minutes the stand allows obtaining a qualitative assessment of the main parameters and identifying shortcomings in the operation of the devices that are part of the spectrometer. The method is based on recording and analyzing the spectrum of a sequence of pulses with a uniform amplitude distribution within the input dynamic range of the ADC. The principle of the device operation is described. A brief analysis of the requirements for the parameters of the measuring stand is performed, as well as an analysis of the possibility of determining differential and integral nonlinearity of the ADC, channel profile, noise level estimation in the measuring path with the help of the proposed method. The results of testing of some samples of spectrometric analog-to-digital converters are given and a brief analysis of the results is provided. The possibilities of improving the method are considered for the purpose of obtaining a quantitative estimate of the differential and integral nonlinearity, as well as the noise level of the equipment under test.
Highlights
A brief analysis of the requirements for the parameters of the measuring stand is performed, as well as an analysis of the possibility of determining differential and integral nonlinearity of the ADC, channel profile, noise level estimation in the measuring path with the help of the proposed method.
В этом случае, например, для обнаружения дифференциальной нелинейности на уровне KDM = 1 % при тестировании спектрометрического двенадцатиразрядного АЦП (Nmax = 4096 каналов) в соответствии с выражением (10) период следования модулирующих импульсов не должен превышать 0,366 мс, то есть, частота модулирующего генератора должна составлять не менее 2,73 кГц.
На спектре присутствуют периодически повторяющиеся отклонения отдельных точек, свидетельствующие о наличии в некоторых каналах достаточно большой дифференциальной нелинейности, что не характерно для аналого-цифровых преобразователей последовательного счета.
Summary
A brief analysis of the requirements for the parameters of the measuring stand is performed, as well as an analysis of the possibility of determining differential and integral nonlinearity of the ADC, channel profile, noise level estimation in the measuring path with the help of the proposed method. В этом случае, например, для обнаружения дифференциальной нелинейности на уровне KDM = 1 % при тестировании спектрометрического двенадцатиразрядного АЦП (Nmax = 4096 каналов) в соответствии с выражением (10) период следования модулирующих импульсов не должен превышать 0,366 мс, то есть, частота модулирующего генератора должна составлять не менее 2,73 кГц.
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