Timeline for Parallelizing op-amps for higher precision
Current License: CC BY-SA 4.0
15 events
| when toggle format | what | by | license | comment | |
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| Aug 22, 2022 at 17:18 | history | edited | ocrdu | CC BY-SA 4.0 |
added 4 characters in body; edited title
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| Jul 29, 2022 at 5:27 | comment | added | PStechPaul | It is good practice to use resistors on the op-amp inputs to balance the impedances. And gate resistors might also help. | |
| Jul 29, 2022 at 4:50 | history | became hot network question | |||
| Jul 29, 2022 at 3:01 | history | tweeted | twitter.com/StackElectronix/status/1552851689752985600 | ||
| Jul 29, 2022 at 0:05 | vote | accept | Tempus Nomen | ||
| Jul 28, 2022 at 22:54 | answer | added | Kuba hasn't forgotten Monica | timeline score: 12 | |
| Jul 28, 2022 at 22:48 | comment | added | Tempus Nomen | Glancing over the resources online, it seems it also cascades the error per stage of an opamp. Btw, is that novice impression true for all cascading of opamps (as opposed to parallelizing)? | |
| Jul 28, 2022 at 21:29 | comment | added | Spehro 'speff' Pefhany | Google “composite amplifier”. There is quite a bit of good background information out there. If you have a specific issue then back here might be an appropriate place to raise it. | |
| Jul 28, 2022 at 21:23 | comment | added | Tempus Nomen | See, a very good opamp does the job of being accurate to a few microvolts. The problem is that I was doing a rather complicated biasing with virtual grounds. Hence the opamp's output has ripples. Hence the NMOS' voltage output lost accuracy & has very small ripples too. I was hoping to remedy it. | |
| Jul 28, 2022 at 21:17 | comment | added | Tempus Nomen | NO, NO... I'm referring to the MOSFET being a follower. The V_IN is 6V & at the source side, at the resistor (I should've labelled it V_OUT), it produces voltage nearly 6V as well. | |
| Jul 28, 2022 at 21:12 | comment | added | MarkU | How does the idea of accuracy even apply to a FET? Are you expecting the FET to have zero volts between drain and source with current flowing through the channel? Any real FET will have some non-zero on-resistance, regardless of what drives Vgs. | |
| Jul 28, 2022 at 21:02 | comment | added | Tempus Nomen | At least, LTSpice is showing that for the universal opamp or any decent opamp, driving a typical NMOS, one can get NMOS outputs with accuracy to millivolts & starts being inaccurate in the microvolts. | |
| Jul 28, 2022 at 20:58 | comment | added | winny | Please elaborate on ”NMOS is only accurate down to millivolts”. Accurate how? | |
| Jul 28, 2022 at 20:56 | history | edited | Tempus Nomen | CC BY-SA 4.0 |
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| Jul 28, 2022 at 20:50 | history | asked | Tempus Nomen | CC BY-SA 4.0 |