In FFT-based (digital) spectrum analyzers, RBW is inversely proportional to the number of samples acquired. By taking more samples in the time domain, or making the acquisition time longer while keeping the sampling rate the same, the signal's resolution is lowered. The result is more bins in the same span and improved viewing/recording of frequency resolution. Given the 12bit A/D converter and the WBT's FFT bin size/digital stack, what is the smallest frequency we can display, or the smallest frequency that can be resolved and captured within a selected bandwidth?

In FFT-based (digital) spectrum analyzers, RBW is inversely proportional to the number of samples acquired. By taking more samples in the time domain, or making the acquisition time longer while keeping the sampling rate the same, the signal's resolution is lowered. The result is more bins in the same span and improved viewing/recording of frequency resolution. Given the 12bit A/D converter and the WBT's FFT bin size/digital stack, what is the smallest frequency we can display, or the smallest frequency that can be resolved and captured within a selected bandwidth?

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