Timeline for Determining Operational Amplifier Offset Voltage
Current License: CC BY-SA 3.0
6 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Feb 22, 2018 at 14:32 | comment | added | Sven B | In addition to Tako's comment: be careful when simulating corners. They often affect all transistors of the same type in the same way, so they do not model mismatch. | |
| Feb 18, 2018 at 23:28 | comment | added | Tako | Yes, in a properly designed opamp, the offset is very or extremaly low, but only in a "perfect" no Monte Carlo simulation. For more realistic approach, you need to run Monte Carlo. | |
| Feb 18, 2018 at 22:16 | vote | accept | Nedvved | ||
| Feb 18, 2018 at 22:16 | |||||
| Feb 18, 2018 at 22:16 | comment | added | Nedvved | Thanks for this clarification - actually I've succeeded to make approximation close enough for my needs with unity-gain configuration (after some layout improvements - dummy transistors and slightly increasing input pair size). FiddOhm's answer pointed out some mistakes in my approach and afterwards it came out not to be so hard. Also, trying to amplify sine wave in open loop showed that it is necessary to adjust offset for each case (here schematic, rc extracted netlist and c extrated) - in my case, running only typical corner sim, it varied from 0.1 to 0.2 mV. Are my conclusions reasonable? | |
| Feb 18, 2018 at 22:02 | vote | accept | Nedvved | ||
| Feb 18, 2018 at 22:02 | |||||
| Feb 18, 2018 at 20:10 | history | answered | Sven B | CC BY-SA 3.0 |