Extra exam question E7F11

WhyIn the absence of atmospheric or thermal noise, a direct-sampling software defined receiver's minimum detectable signal level is set by the reference voltage level and sample width in bits. In the absence of atmospheric or thermal noise, a direct-sampling SDR's minimum detectable signal level is set by the ADC's reference voltage level together with its sample width in bits, since those two factors together determine the smallest voltage step the converter can actually resolve, answer B. Sample clock phase noise, data storage transfer rate, and missing codes/jitter are real converter imperfections, but they aren't what fundamentally sets this noise-free minimum detectable signal floor.