Timeline for Why do I observe ringing on gate driver logic input?
Current License: CC BY-SA 4.0
14 events
| when toggle format | what | by | license | comment | |
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| Sep 14 at 19:06 | answer | added | jp314 | timeline score: 0 | |
| Sep 13 at 9:49 | review | Close votes | |||
| Sep 18 at 20:32 | |||||
| Sep 13 at 4:57 | comment | added | Russell McMahon♦ | Regardless of why: 1. Ground scope probe at ground d point as close as possible to test point (or closer :-) ) || 2. Add series R - maybe 4 to 10 Ohm. || 3. Add small Schottky AT driven pin, cathode to pin, anode to closest ground, minimum loop size. | |
| Sep 13 at 4:11 | comment | added | Simon Fitch | Before you go down any rabbit holes, check your supply rails for ringing, first suspect is always inadequate decoupling. How are you getting your 12V and 3.3V supplies? Do they share any common voltage source? | |
| Sep 13 at 3:57 | comment | added | periblepsis | @learnvst Doesn't it seem as though the heavy and rapid load change is being seen by a very sensitive input? | |
| Sep 13 at 2:34 | comment | added | MOSFET | Oh yeah? 0.2 ohms from DUT to scope faceplate ground. At what frequency? (wink) | |
| Sep 13 at 2:32 | comment | added | MOSFET | The probe still needs to be grounded. Earth referenced or not. You basically have an antennae. | |
| Sep 13 at 1:53 | comment | added | Tim Williams | Does it still show when probing circuit ground? | |
| Sep 13 at 1:37 | comment | added | learnvst | measuring 0.2 ohm from circuit under test to face plate on scope | |
| Sep 13 at 1:32 | comment | added | learnvst | Mains earth referenced | |
| Sep 13 at 1:29 | comment | added | MOSFET | Your probe has no ground? | |
| Sep 13 at 1:25 | history | edited | learnvst | CC BY-SA 4.0 |
added 111 characters in body
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| Sep 13 at 1:17 | comment | added | MOSFET | Post your circuit. And a picture of your setup would be useful. Including probe location. | |
| Sep 13 at 1:14 | history | asked | learnvst | CC BY-SA 4.0 |