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

 

 

 How does the frequency response look?

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

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

 Compare the two cases by using PSpice

 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.

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

 How does the signal look like at input and output?

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

 

Tutorial video

 

 NB: We also have a PCB Design exercise for this circuit

 See the exercise here!

 Are you keeping up? Go back and watch the previous videos if not.

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