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TLV9001: PWM DAC -> Sallen Key Butterworth Low Pass Filter

Part Number: TLV9001
Other Parts Discussed in Thread: TLV9061, TLV9062,

Hi All,

i'm trying to design a PWM DAC with Active Second order Sallen Key Butterworth Low Pass Filter with one stage.

But i got spikes on the Vo please see simulation file attached.

Here is my calculation as per: SLOA049B

R1 2.321663 kOhm Butterworth
R2 10.18273 kOhm FSF 1
C1 10 nF Q 0.707107
C2 33.06982 nF
f_PWM 100 kHz
f_c 1.8 kHz
n 3.306982
m 0.228
SQRT(mn) 0.868327
R 10.18273 kOhm
C 10 nF


Thank you for the help.