60 Hz Notch filter design

Hi:

This is a common rookie mistake. In the first schematic that you have tried to copy, the OP-amps are powered from dual + and - supplies. The positive input pins on the four op-amp that are connected to ground will be thus 1/2 way between the rails. In your LTspice simulation you have the four + inputs still connected to ground but are powering the op-amps from a single positive supply with the negative supply pin grounded. If you read the datasheet for the op-amp you are using you will probably see that the input common mode range does not include the negative supply pin.

If you wish to operate your circuit from a single positive supply then you  need to generate a bias voltage at the middle of the power supply VCC/2 as it were. And connect the "grounded" components in the first schematic to that voltage. Mainly the + inputs on the op-amps but better to do all the connected components. In addition the input signal will need to be centered, ie. swing around this mid point of the power supply.

Ah, so I was able to do that:

However, I do not get the negative magnitude I should be getting:

This is the magnitude by the filter design tool I used to

But this is the bode plot from my circuit

8156.60_notch.asc