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本帖最后由 超級狗 于 2017-4-8 20:21 编辑
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The network consisting of RS, C1, and C2 is relatively common when driving CMOS switched capacitor ADC inputs with a transformer. The RS resistors serve to isolate the transformer secondary winding from the switching transients, and the optimum value (determined empirically) generally ranges from 25 to 100 Ω. The C1 capacitors serve as common-mode charge reservoirs for the switching transients and also provide noise filtering (in conjunction with the RS resistors). The C1 capacitors should have no greater than 5% tolerance to prevent common-mode to differential signal conversion. If needed, C2 can be added for additional differential filtering. Datasheets for most CMOS ADCs, typically recommend optimum values for RS, C1, and C2 and should be consulted in all cases.9 `0 B- T% a: q3 T, ^* g+ o
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发表于 2017-4-8 11:56
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来自 8#
发表于 2017-4-10 20:42
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