Timeline for Design a high accuracy ADC circuit (example of differential ADC LTC2348 for PSD signals)
Current License: CC BY-SA 4.0
39 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| S Sep 16, 2020 at 23:01 | history | bounty ended | CommunityBot | ||
| S Sep 16, 2020 at 23:01 | history | notice removed | CommunityBot | ||
| Sep 8, 2020 at 21:41 | comment | added | Voltage Spike♦ | @user42875 Thanks, I just hate to see the bounty wasted. | |
| S Sep 8, 2020 at 21:37 | history | bounty started | user42875 | ||
| S Sep 8, 2020 at 21:37 | history | notice added | user42875 | Authoritative reference needed | |
| Sep 8, 2020 at 21:37 | comment | added | user42875 | @VoltageSpike: I waited for a long time and thought no one would answer. But since you went through the trouble of helping me, I'll start another one and give it to you - expensive mistake, but I don't like doing that to helpful contributors! | |
| Sep 8, 2020 at 21:26 | comment | added | Voltage Spike♦ | @user42875 because you didn't assign an answer, the bounty went to waste | |
| Sep 8, 2020 at 21:25 | vote | accept | user42875 | ||
| S Aug 27, 2020 at 19:02 | history | bounty ended | CommunityBot | ||
| S Aug 27, 2020 at 19:02 | history | notice removed | CommunityBot | ||
| Aug 25, 2020 at 21:00 | history | tweeted | twitter.com/StackElectronix/status/1298364551021449219 | ||
| Aug 25, 2020 at 19:55 | answer | added | td127 | timeline score: 1 | |
| Aug 25, 2020 at 18:15 | history | edited | Voltage Spike♦ | CC BY-SA 4.0 | added 4 characters in body |
| Aug 25, 2020 at 18:11 | answer | added | Voltage Spike♦ | timeline score: 2 | |
| Aug 23, 2020 at 21:19 | comment | added | user42875 | Anyone? 150 rep going to waste would be a shame... | |
| Aug 19, 2020 at 22:01 | history | edited | user42875 | CC BY-SA 4.0 | added 66 characters in body |
| Aug 19, 2020 at 17:32 | history | edited | user42875 | CC BY-SA 4.0 | deleted 105 characters in body |
| S Aug 19, 2020 at 17:27 | history | bounty started | user42875 | ||
| S Aug 19, 2020 at 17:27 | history | notice added | user42875 | Draw attention | |
| Aug 19, 2020 at 17:26 | history | edited | user42875 | CC BY-SA 4.0 | deleted 105 characters in body |
| Aug 19, 2020 at 15:37 | history | edited | user42875 | CC BY-SA 4.0 | added 7 characters in body |
| Aug 19, 2020 at 15:30 | history | edited | user42875 | CC BY-SA 4.0 | added 7 characters in body |
| Aug 19, 2020 at 15:16 | history | edited | user42875 | CC BY-SA 4.0 | added 268 characters in body |
| Aug 19, 2020 at 14:59 | history | edited | user42875 | CC BY-SA 4.0 | added 113 characters in body |
| Aug 19, 2020 at 13:02 | comment | added | user42875 | I'm waiting 3 more hours and I'll put a bounty on this question, +150. Would that be worthwhile for you to answer these questions by annotating my schematics/layouts? | |
| Aug 19, 2020 at 13:00 | comment | added | user42875 | Thanks for your comment. I would like to allow any PSU, so if only some are isolated I have to assume the connected PSUs will not. I am open to changing my grounding scheme by connecting the ground of my +/-15V supply to the SMA_SHIELD plane (looking like a star) instead of AN_GND, but that may result in a ground loop through mains... What do you mean the SMA shield connections raise eyebrows? Also, I don't understand why my SE-BP to differential conversion would not work? How would I filter,buffer,convert to differential in one stage instead? | |
| Aug 19, 2020 at 12:49 | history | edited | user42875 | CC BY-SA 4.0 | added 2 characters in body |
| Aug 19, 2020 at 12:27 | comment | added | Chris Knudsen | Please be confident of your power and signalling grounds. I personally do not agree with your grounding topology, but that is a debate that often ends with drawing at ten paces. Specifically the apparent lack of a star ground, and the SMA shield connections raise eyebrows. Luckily, your bandwidth is low, and you can probably heavily average/median the results to get 14 bits. Also, you are not using true differential drivers to the ADC. The signals on the SMA are likely Single-Ended, Bi-Polar. Consider adding a conversion stage to convert to differential, and you will add 1 or 2 more bits. | |
| Aug 19, 2020 at 11:07 | history | edited | user42875 | CC BY-SA 4.0 | deleted 4 characters in body |
| Aug 19, 2020 at 11:05 | comment | added | user42875 | Post entirely updated to reflect the fact I had forgotten to buffer the signals ; I've also added a grounding diagram and views to easily spot where the signals went. | |
| Aug 19, 2020 at 11:01 | history | edited | user42875 | CC BY-SA 4.0 | added 390 characters in body; edited title |
| Aug 18, 2020 at 15:00 | history | edited | user42875 | CC BY-SA 4.0 | deleted 230 characters in body |
| Aug 18, 2020 at 14:54 | history | edited | user42875 | CC BY-SA 4.0 | deleted 230 characters in body |
| Aug 17, 2020 at 21:54 | history | edited | user42875 | CC BY-SA 4.0 | added 95 characters in body |
| Aug 17, 2020 at 19:15 | comment | added | user42875 | Also, I'd like to learn by projects, this is a good opportunity to improve my knowledge of analog design since I've already done the best I could. | |
| Aug 17, 2020 at 19:14 | history | edited | user42875 | CC BY-SA 4.0 | added 114 characters in body |
| Aug 17, 2020 at 19:09 | comment | added | user42875 | Interesting link, thanks. I can only take away some isolated bits because the ADC is not the same (and, I find, Less suitable). I know first spins are rare, but they are quite common with simple functional blocks. I haven't had to respin simple boards for a while (though they were mostly digital I must admit), and so I'm expected to do the same for this one (student project with tight schedule)... | |
| Aug 17, 2020 at 18:36 | comment | added | Chris Knudsen | Even though I, frankly, don't have the time or interest to step though your design, I immediately thought of this project: https://reference.digilentinc.com/reference/instrumentation/analog-discovery-2/reference-manual#scope. Perhaps you could reduce the risk of not prototyping by learning from another successful design. BTW: Electronics design is much like programming, it is never completed on the first spin. | |
| Aug 17, 2020 at 17:10 | history | asked | user42875 | CC BY-SA 4.0 |