I'm simulating a 4 stage filter/amp circuit using the OP162 within Altium and Multisim. I'm getting very strange outputs compared to using other TI branded opamp. When I try to simply create a voltage follower using the OP162 with an input of 100uV sin wave, the output is offset by around +50uV. I get the same results using Altium and Multisim.
1. Can someone give me a hint as to why I'm getting this output offset?
2. Is the model correct?
3. Should I be looking for a different amp for this application?
My application is to filter (500-5,000Hz) and amplify (3000x) a small biological signal (100uV, 500 - 5,000 Hz bandwidth).
Product Page: http://www.analog.com/en/all-operational-amplifiers-op-amps/operational-amplifiers-op-amps/op162/products/product.html
This offset is specified in the datasheet, page 3, as a 45uV typical input offset. So in unity gain, with the non-inverting terminal grounded, you would expect to see the output reflect the input offset with some small additional error. As such, I would believe the model is functionally correct.