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Output voltage lag in AC RC low-pass filter

Discussion in 'General Electronics Discussion' started by 1talic, Mar 12, 2017.

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  1. 1talic


    Mar 12, 2017

    Can anyone help simply explain to me why the output waveform in an AC RC low-pass filter circuit lags behind the input signal waveform?

    Thanks in advance!
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    A rather simplistic explanation: the resistor limits the current available to flow into or out of the capacitor therefore it takes some time for a change in input voltage to appear at the output.
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