bandpass filter
bandpass filter
(OP)
i need help designign a bandpass filter using opamps centered at 75 khz.
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RE: bandpass filter
RE: bandpass filter
What you need is called a Delyiannis-Friend circuit
Build like this
Connect R2 between inverting (-) terminal and output of
op-amp.
Connect C1 between R1 and (-) inverting terminal of op-amp.
Connect C2 to between the R1 terminal above and op-amp output.
The loose end of R1 is the input. Ground the non inverting
terminal of the op-amp (+), and power the op-amp with
split supplies.
Make C1=C2=C
Resonant Freq = 1/(2*pi*sqr(R1*R2)*C)
Q factor = 0.5*(SQR(R2/R1)
Voltage gain is 2*Q^2 at resonance so an input
attenuator may be needed.
RE: bandpass filter
Julian