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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN3137 датащи(PDF) 34 Page - STMicroelectronics |
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AN3137 датащи(HTML) 34 Page - STMicroelectronics |
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34 / 42 page  Methods for precision improvement AN3137 34/42 Doc ID 16983 Rev 3 Figure 19. Parasitic capacitances of sampling switch This charging and discharging currents (PMOS and NMOS asymmetric capacitances) can cause charge transfer to sampling capacitor Csh. Internal charging of sampling capacitor It is possible that after the conversion process (successive approximation process in SAR type of ADC) the sample and hold capacitor Csh is charged to some voltage. The reason can be: ● some leakage current to Csh (parasitic current inside ADC structure, see Figure 20) ● residual charge transfer from the switches when ADC structure is switched back to default state before next conversion ● other reasons (related to internal ADC parasitic structures) Figure 20. Parasitic current example inside ADC structure |
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