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