What is the low frequency magnitude of a filter ? There is a question in my textbook asking me to find this but l don't know what is it. Can someone please explain to me

 

Maybe it refers to the filter's gain on very low frequencies, where you can simulate the filter's capacitors with open-circuits. Also known as DC gain.

 

Maybe it refers to the filter's gain on very low frequencies, where you can simulate the filter's capacitors with open-circuits. Also known as DC gain.

And the inductors, if any, as short-circuits.

 

Of course, those too. Even though they are more rare in a common filter circuit.

 

When it comes to filters "magnitude" refers to the gain(loss) with respect to some reference point. That reference point is usually the input, and the output level is compared to the input as a function of frequency.

 

Thank you very much. Low frequency magnitude is DC gain apparently.