We try to design a notch filter on 400Hz by ADA4077-4 but it can't work. Would you kind to give some recommendation ?Thanks.
I would not do a new design with the OP2177. The next generation part, the ADA4077-2, is now released.
Take a look.
The OP4177 is verrrrrry old; Why not use one of the newer generation parts with built in
over voltage protection, such as the ADA4077-4 or the ADA4177-4??
PS: I have read the article,
Op Amp Input Overvoltage Protection | Analog Devices
It surely lists many benefits in using ADA4177 over ADA4077 + TVS.
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