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spi2 attenuation control

When I switch state trough gpio_4  after I have set attenuation values trough spi-2, I noticed following effects:

in red: undershoot of 2dB during 200ns.

in yellow: extra ripple during 4us.

What can I do to improve this undershoot and ripple?

And for the falling part, is it possible to switch faster then the 200ns?

regards,
Jan