Reception of the feeble energetic signal as a part of composite in case of analog digital conversion in broad band of frequencies

Abstract

Results of researches of the achievable relation signal/noise for a narrowband signal with considering filtering in case of analog digital conversion of a broadband composite signal are provided. Lowering of the relation signal/noise in case of broadband digitization defines possibilities of reception of feeble signals in a compound. It is connected to action of quantization noises that is especially critical in case of the small number of levels of quantization and not ideality of
characteristics of ADC. The purpose of researches - to evaluate the achievable relation signal/noise when filtering feeble signals after digitization for the purpose of their further demodulation. In the
course of the theoretical analysis and simulation it is shown that the pacing factor restricting the relation signal/noise is drift of zero ADC. It is shown that restoration is possible only if value of
drift of zero on the module is less, than MSD of an additive noise in a compound of a composite signal.