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TLV320AIC3256: Filter design equations

Part Number: TLV320AIC3256

Hi,

I  am using the Biquad Filter Design Tool in the  PurePath Studio. I choosed the Equalizer(Q factor)  filter. Then I set the Fc, Gain, Q as shown in Fig.1 

Applying the equations in section 1.2 of Biquad Filters Application Note.pdf, I computed  five biquad coefficients –b0, b1, b2, a1, a2 – , but the results is different from the results given by the PPS Bi-quad tool which is listed as follows, I want to know the reason.

  • The Biquad Filter Design Tool in PurePath Studio will adjust the coefficients, changing their gain to maintain stability and avoid overflow due to fix point quantization implementation and cascading several biquads together.

    best regards,

      Pedro