Guide to Spectrum and Signal Analysis

Guide to Spectrum and Signal Analysis
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Guide to Spectrum and Signal Analysis

  • 10 | Guide to Spectrum and Signal AnalysisThe IF bandwidth is normally specified by Δf at 3 dB (Figure 9). From this it can be seen that the narrower the filter bandwidth the greater the frequency resolution. However, as mentioned earlier, as the IF band width is reduced so the charge time for the filter increases hence increasing the sweep time. As an ex ample, narrow IF bandwidths are required to distinguish the sidebands of amplitude and frequency modulated signals (Figure 10).Figure 9Δf @ –3 dBFigure 10