I need a help in Butterworth filter design. The question is as follows.
A high frequency signal is susceptible to 50Hz mains pick-up. A second order Butterworth active filter with a corner frequency 800Hz is used to reduce the pick up signal. Sketch the magnitude characteristic of the filter (dB versus log f) and estimate the filter output if a 50Hz, 1 volt input is applied to it.
I had started doing it as follows:
800Hz = 1/2∏RC
RC = 1/1600∏
I cannot quit understand what is mentioned by "A high frequency signal is susceptible to 50Hz mains pick-up"
Thank you in advance
A high frequency signal is susceptible to 50Hz mains pick-up. A second order Butterworth active filter with a corner frequency 800Hz is used to reduce the pick up signal. Sketch the magnitude characteristic of the filter (dB versus log f) and estimate the filter output if a 50Hz, 1 volt input is applied to it.
I had started doing it as follows:
800Hz = 1/2∏RC
RC = 1/1600∏
I cannot quit understand what is mentioned by "A high frequency signal is susceptible to 50Hz mains pick-up"
Thank you in advance