This thesis addresses the problem of offset in operational amplifiers. Offset or input referred offset, is a voltage that has to be added to an input in order for the operational amplifier to produce a zero output level if both inputs are at the same voltage level.
There are many types of offset, but I focus on the EMI induced offset which is a problem encountered in EMI polluted environments (automotive industry etc.).
I examine the reasons why this offset forms by deriving a mathematical model which will give insight into how various op amp parameters influence offset. I then compare the model to measurement data from produced test chips and also simulate the offset.
This provides a deeper understanding of the problem and reinforces the proposed mathematical model.