help switched-capacitor filter

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hong_vito

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switched capacitor filter

hi everyone:
I design Elliptica low pass filter , pass band frequecny 260hz
pass band riggple 1db, stop band frequecny 300hz,
stop bnad attenuation 35db

why do I filter out (f_out),have to 6ms stable?

Is't OP phase margin, SR. ?

thank your help
 

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