Active band-pass filter

A band-pass filter is a device that passes frequencies within a certain range and rejects (attenuates) frequencies outside that range. An active filter also uses an active component like an operational amplifier.


Learning goals:
  • Net Alias
  • Evaluate Measurement
  • Append Waveform
  • Monte Carlo/Worst Case
  • Component tolerance
  • Sensitivity analysis


 Create the schematic below in OrCAD Capture. This is an active band-pass filter with Fc = 1,59kHz og Q = 10


  1. How does the frequency response look

  2. Find the cut-off frequency Q and Vmax by using PSpice

  3. Do the same for R1=R2=R3=R4=1,4k og R5=4,02k

  4. Compare the two cases by using PSpice

  5. The resistors and the capacitors have a tolerance of 5%. Use Monte Carlo simulations to find out how such filter will look like in reality.

  6. Now change the tolerance of all resistors to 0,1% and run Monte Carlo again

  7. How does the signal look like at input and output?

  8. Use Sensitivity under PSpice Advanced Analysis to find out which components have the largest impact on the cut-off frequency Q and Vmax


Video tutorial





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