Hello, TI Community!
I am currently working on an ECG circuit. I am having some difficulty building the band pass filter. The op-amp keeps saturating, so I am wondering why this is happening. I am enclosing pictures of the filter design from the TI Design Program. I am using two OPA2227, I also was using an OPA4227, but I thought the saturation issue came from attempting to use one IC, so I went with two separate IC's, but the issue persists. I need to use an opamp that comes in a DIP package to test on a breadboard, so that's why I went with this option. Any better op amps that come in an DIP package would also be considered.
Any advice you can provide would be greatly appreciated.
Thanks!
Low Pass Filter - fc = 40.6Hz
HPF - fc = 0.49
Here is a schematic of the entire circuit (I replaced the filters in this circuit - Two LM358, with the filters shown above), instead of INA116, I am using INA121: