The constant corresponds to the value −46 dB, plotted in Figure 3(a) as a line of zero slope. \Įach of the terms in the logarithmic magnitude expression can be plotted individually. RC Low-Pass Filter Bode PlotsĬonsider the RC low-pass filter. The individual Bode plots of these four distinct terms are all well approximated by linear segments, which are readily summed to form the overall Bode plot of more complicated frequency response functions. Simple poles or zeros (1 + jωτ) or (1 + jω/ω o).ĭ. Moreover, there are only four distinct types of terms present in any frequency response function:Ĭ. The advantage here is that Bode (logarithmic) plots can be constructed from the sum of individual plots of individual terms.
The product of terms in a frequency response function becomes a sum of terms because log( ab/c) = log( a) + log( b) − log( c). While logarithmic plots may at first seem a daunting complication, they have two significant advantages:ġ.
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