![]() The cut-off frequency point for a first order high pass filter can be found using the same equation as that of the low pass filter, but the equation for the phase shift is modified slightly to account for the positive phase angle as shown below. However in practice, the filter response does not extend to infinity but is limited by the electrical characteristics of the components used. 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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