Timeline for High-gain transimpedance amplifier with photodiode not functioning as expected
Current License: CC BY-SA 4.0
11 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Feb 13 at 0:21 | history | edited | ocrdu | CC BY-SA 4.0 |
deleted 1 character in body; edited tags; edited title
|
| Feb 13 at 0:16 | answer | added | Kuba hasn't forgotten Monica | timeline score: 1 | |
| Feb 12 at 23:26 | comment | added | Kevin White | Why is it a problem? A small negative voltage into the microcontroller will not cause any problems. | |
| Feb 12 at 21:54 | answer | added | user319836 | timeline score: 0 | |
| Feb 12 at 21:44 | comment | added | user1850479 | If you want to reverse bias the photodiode you need to add a negative rail to the opamp or else use a negative voltage on the reverse bias. If you just flip the photodiode around then the output will be a negative voltage. However, I don't see any problem with a negative voltage here given the 100k ohm resistor. | |
| Feb 12 at 21:39 | comment | added | Nick Alexeev | Out of curiosity, how do you get a situation when an op-amp is off (powered down) while the microcontroller is on? | |
| Feb 12 at 21:38 | comment | added | periblepsis | What do you mean by "when the OPAMP is off"? Is the Vcc rail disconnected from the supply, while also leaving R1 and R2 active? | |
| Feb 12 at 21:10 | answer | added | Voltage Spike♦ | timeline score: 2 | |
| Feb 12 at 21:07 | comment | added | Voltage Spike♦ | What is the value of RF? | |
| S Feb 12 at 21:02 | review | First questions | |||
| Feb 12 at 21:05 | |||||
| S Feb 12 at 21:02 | history | asked | Mohamed Hamouda | CC BY-SA 4.0 |