# High pass filter phase angle

#### hero22222222222

Joined Dec 22, 2019
78
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Last edited:

#### Marc Sugrue

Joined Jan 19, 2018
222
They arn't the same. They have the same cut off frequency but different phase which indicate one phase is leading the voltage and the other is lagging . You should post an accompanying circuit to clarify the problem

#### Marc Sugrue

Joined Jan 19, 2018
222
Typical high pass as your drawing would be as attached. At the low frequencies the capacitor is doing the most work (DC blocking). Its capacitive reactance acts as very high resistance with 90Deg leading phase of current with respect to voltage. As the frequency is increasing the capacitive reactance (frequency depedant resistance) reduces and so does the phase margin. At high frequency the capacitive reactance is next to nothing and it also has very little effect on phase.

It could be your lecturer is focussing on Voltage on his drawing so he is explaing the Voltage is lagging the current rather than the current is leading the voltage .

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#### Marc Sugrue

Joined Jan 19, 2018
222
Hi thanks I'm just confused why my teacher has shown me a phase that goes from -90 to 0.
I think your lecturer is focussing on Voltage on his drawing so he is explaing that the Voltage is lagging the current rather than the current is leading the voltage its exactly the same but the context is different.