I want to build a voltage reference based on LM4040 (A series 0.1%), the output voltage is switchable with a selector switch:
Assuming that the op amp have input offset of ~100 uV and resistors are 1% but hand picked to match the values;
- How can I calculate the output error?
- Which parameters affects the accuracy (only resistors error,op amp input offset voltage and temperature)?
- Is there any other downside to this configuration other than lowering the accuracy?