Timeline for Opamp current source stable in simulation but unstable on prototype
Current License: CC BY-SA 4.0
5 events
| when toggle format | what | by | license | comment | |
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| Jul 27, 2018 at 14:44 | comment | added | Andy aka | You could drive it like you are doing but add an extra MOSFET's worth of capacitance directly at the output of the op-amp but clearly, that will cause oscillation as per the snippet from the data sheet. | |
| Jul 27, 2018 at 14:41 | comment | added | Linkyyy | Could you recommend another way of measuring the loop gain then?`:) | |
| Jul 27, 2018 at 14:39 | comment | added | Linkyyy | Thanks for your answer. Yes i was aware that this opamp is not supposed to drive more than 500pF, that is why i am trying to compensate it to make it stable :) I see what you mean about the isolation of the mosfet from the gate. But from a control design point of view, the loop gain should not be different? And as long as the DC bias is still intact, shouldn't this be alright then? | |
| Jul 27, 2018 at 10:44 | history | edited | Andy aka | CC BY-SA 4.0 |
added 183 characters in body
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| Jul 27, 2018 at 10:37 | history | answered | Andy aka | CC BY-SA 4.0 |