5/12/2021 0 Comments Active Filter Design Tutorial Pdf
You might have come across filters in network theory tutorial.They are passive and are the electric circuits or networks that consist of passive elements like resistor, capacitor, and (or) an inductor.So, the input of a non-inverting terminal of an opamp is the output of a passive low pass filter.It is having the output of a passive low pass filter as an input to the non-inverting terminal of op-amp.
Hence, it produces an output, which is left(1fracRfR1right) times the input present at the non-inverting terminal. Suppose, if we consider the resistance values of Rf and R1 as zero ohms and infinity ohms, then the above circuit will produce a unity gain low pass filter output. So, the input of a non-inverting terminal of opamp is the output of passive high pass filter. It is having the output of a passive high pass filter as an input to non-inverting terminal of op-amp. Hence, it produces an output, which is left(1fracRfR1right) times the input present at its non-inverting terminal. Suppose, if we consider the resistance values of Rf and R1 as zero ohms and infinity ohms, then the above circuit will produce a unity gain high pass filter output. In general, this frequency band lies between low frequency range and high frequency range. ![]() So, we have to choose the values of RB and CB suitably, to obtain the desired lower cut-off frequency of the active band pass filter. So, we have to choose the values of RA and CA suitably in order to obtain the desired higher cut-off frequency of the active band pass filter. So, active band stop filter allows (passes) both low and high frequency components. The outputs of these two blocks are applied as inputs to the block that is present in the second stage. ![]() Observe that we got the above circuit diagram of active band stop filter by replacing the blocks with the respective circuit diagrams in the block diagram of an active band stop filter.
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