Which of these is incorrect for a band-stop filter?(a) An adder is required when designing it using LPF and HPF(b) LPF and HPF are connected in parallel(c) The HPF cut-off frequency should be much higher than LPF cut-off frequency(d) The LPF and HPF are connected in seriesThis question was addressed to me in an interview for job.Asked question is from Frequency Filters in portion Op-amps and its Applications of Analog Circuits

Which of these is incorrect for a band-stop filter?(a) An adder is req

1.	Which of these is incorrect for a band-stop filter?(a) An adder is required when designing it using LPF and HPF(b) LPF and HPF are connected in parallel(c) The HPF cut-off frequency should be much higher than LPF cut-off frequency(d) The LPF and HPF are connected in seriesThis question was addressed to me in an interview for job.Asked question is from Frequency Filters in portion Op-amps and its Applications of Analog Circuits
Answer» Correct CHOICE is (d) The LPF and HPF are connected in series The explanation: When designing a band-stop filter, a HPF and LPF are connected in PARALLEL, and their output goes into the input of an ADDER to get the desired output. For correct output, the cut-off frequency of HPF should be much HIGHER than that of the LPF.

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