For this project the team was required to design a low pass filter with:

  • A maximum pass band ripple of 2 dB

  • An attenuation figure of 200dB / decade

  • Adjustable cutoff from 15KHz - 30 KHz.

The final candidate for this design involved the use of operational transconductance amplifiers or OTA’s (refer to intuitive OTA’s) and was designed to be a 12th order butterworth gm-c low pass filter. Here is the design report just in case you want to follow a similar approach.

Voltage Controlled Low Pass Filter Analog Design

Pictures of this circuit can be found in the next project.

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