Hi kai klaas69,
I hope this message finds you well. I wanted to reach out regarding the Second-order Butterworth Bandpass Filter circuit (kung_tlv9002.TSC) that you assisted me in designing around five months ago. You can find the original discussion we had on the TI E2E Amplifiers Forum at this link: https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1207108/tlv170-butterworth-filter
I successfully implemented the circuit on an EVB for testing purposes. However, I've encountered an issue with the output waveform. Specifically, there seems to be distortion occurring when the frequency is below 900Hz. I have attached a Statistical Chart(Excel) and waveforms(JPG) for your reference.
I would greatly appreciate your expertise in addressing this problem. If you could provide guidance on how to rectify this distortion issue, I would be very grateful.
Thank you for your time and assistance.
Best regards,
Kungyeh