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TLV9002: Please fine-tune the Second-order Butterworth Bandpass Filter circuit

Part Number: TLV9002

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 7 months ago. You can find the original discussion we had on the TI E2E Amplifiers Forum at this link:


I tested the frequency response by inputting 150mVpp at 1kHz and found that the low-frequency (below 400Hz) in the output waveform were too low, as shown in the diagram below.

If bypassing Bandpass Filter circuit (kung_tlv9002.TSC) . It appears that there is no attenuation.

I tried changing C4 from 10nF to 33nF. The low frequencies passed, but the high frequencies failed.

Please assist in fine-tuning the circuit so that it maintains -3dB or higher at 300Hz.

Thank you!