Timeline for Design of a simple transimpedance amplifier for large area photodiode
Current License: CC BY-SA 4.0
17 events
| when toggle format | what | by | license | comment | |
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| Sep 2, 2020 at 13:08 | vote | accept | Legriano | ||
| Aug 31, 2020 at 14:30 | answer | added | user1850479 | timeline score: 3 | |
| Aug 31, 2020 at 9:50 | answer | added | JRE | timeline score: 2 | |
| Aug 31, 2020 at 9:34 | history | edited | JRE | CC BY-SA 4.0 |
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| Aug 31, 2020 at 8:45 | history | edited | Legriano | CC BY-SA 4.0 |
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| Aug 31, 2020 at 4:11 | history | edited | JRE | CC BY-SA 4.0 |
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| Aug 30, 2020 at 19:32 | answer | added | csabahu | timeline score: 3 | |
| Aug 30, 2020 at 18:25 | comment | added | user1850479 | Did you update the resistor and capacitor values for your photodiode like your link explains? If so, that is critical information you must provide. If you didn't, then no surprise your circuit doesn't work well. | |
| Aug 30, 2020 at 17:39 | comment | added | jonk | Pole placement on the 1st stage needs some careful consideration (for noise) but also ideas such as stopping leakage by using guard rings actively driven to a virtual ground, etc. There are a lot of little things that matter a lot in a high gain 1st stage amplifier. Even board cutaways might be considered. (Tear open a Kiethley coulomb meter and just look over their board layout.) (You aren't in this circumstance, but I've even had too much leakage in the IC package itself, between pins and had to strip it down to the die to get rid of it. But start with your pole analysis.) | |
| Aug 30, 2020 at 17:37 | comment | added | jonk | Look papers by Bonnie Baker (used to be a very sterile personality when talking with her) and Jim Todsen (used to be quite the opposite and very embracing by comparison.) Both at one time worked for Burr Brown, which produces some very nice ICs with respect this kind of application area. I'm thinking more towards papers by Bonnie Brown, though. They are pretty good, relatively easy to read and understand, and cover most of what you need to know to think for yourself. | |
| Aug 30, 2020 at 16:46 | comment | added | D.A.S. | Where are the PD datasheet link and photos of your layout with schematic? is this for DC or AC what f, sensitivity? | |
| Aug 30, 2020 at 16:10 | comment | added | D.A.S. | Do you have any design specs? the very high impedances makes any conductor look like an antenna, so ground planes are needed to shunt stray noise. | |
| Aug 30, 2020 at 16:04 | answer | added | glen_geek | timeline score: 1 | |
| Aug 30, 2020 at 15:56 | comment | added | Andy aka | Show your actual circuit with component details, power supply decoupling and specify the power supply you used and how you constructed it. | |
| Aug 30, 2020 at 15:26 | comment | added | D.A.S. | That noise beats most others I’ve seen. use differential amplifier With same RC parts with STP cable and an LDO to supply supply noise then maybe an RF cap from Earth Gnd to 0V with cct over a ground plane, not a breadboard | |
| Aug 30, 2020 at 15:17 | review | First posts | |||
| Sep 9, 2020 at 9:11 | |||||
| Aug 30, 2020 at 15:13 | history | asked | Legriano | CC BY-SA 4.0 |