More noise with highpass filter

Hi,

ADSP-21489

I'm using the IIR hardware accelerator of the DSP with it's own example program provided by analog devices.

I have implemented a 6th order IIR low and highpass filter with cutoff frequency 800 Hz. As shown in the pictures, the noisefloow with the highpass filter is much higher than the one with the lowpass filter. Has anyone got an idea where that might come from?

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