The frequency response curve for this filter implies that the filter can pass all signals out to infinity. It has a response curve that extends down from infinity to the cut-off frequency, where the output voltage amplitude is 1/√ 2 = 70.7% of the input signal value or -3dB (20 log (Vout/Vin)) of the input value.Īlso we can see that the phase angle ( Φ ) of the output signal LEADS that of the input and is equal to +45 o at frequency ƒc. Here the signal is attenuated or damped at low frequencies with the output increasing at +20dB/Decade (6dB/Octave) until the frequency reaches the cut-off point ( ƒc ) where again R = Xc. The Bode Plot or Frequency Response Curve above for a passive high pass filter is the exact opposite to that of a low pass filter.
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