Timeline for How to remove 20MHz SPI signal noise?
Current License: CC BY-SA 3.0
14 events
| when toggle format | what | by | license | comment | |
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| Nov 30, 2012 at 19:37 | vote | accept | Penghe Geng | ||
| Nov 30, 2012 at 19:37 | history | edited | Penghe Geng | CC BY-SA 3.0 |
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| Nov 30, 2012 at 7:02 | history | tweeted | twitter.com/#!/StackElectronix/status/274407959059132416 | ||
| Nov 30, 2012 at 6:20 | answer | added | D.A.S. | timeline score: 5 | |
| Nov 30, 2012 at 6:04 | answer | added | Gustavo Litovsky | timeline score: 7 | |
| Nov 30, 2012 at 4:57 | comment | added | Anindo Ghosh | Two queries: 1. Do you happen to have a CFL lamp near your test set-up? I always get 38 KHz and 1.7 MHz ripples on my scope when I switch on my CFL table lamps. 2. Is your 3.3 Volt regulator possibly generating a bad ripple on load? | |
| Nov 30, 2012 at 4:28 | comment | added | Connor Wolf | Take a look at this question. Try using one of these probe ground clips. | |
| Nov 30, 2012 at 4:28 | history | edited | Penghe Geng | CC BY-SA 3.0 |
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| Nov 30, 2012 at 4:27 | comment | added | Penghe Geng | Thanks. I do use the clip ground lead. By "a better ground", do you mean I need to change a different ground location, or to change to a probe without clip ground lead? | |
| Nov 30, 2012 at 4:18 | comment | added | Connor Wolf | Anyways, I would try to check your oscilloscope measurement first. How are you grounding your scope-probe? If you're using the clip ground lead, you may be getting noise induced there. Try using a better ground, to eliminate possible confounding factors. | |
| Nov 30, 2012 at 4:17 | comment | added | Penghe Geng | Well, for SPI, the clock is only present when Chip Select is active during a transfer. | |
| Nov 30, 2012 at 4:15 | comment | added | Connor Wolf | Your clock should have a constant voltage on it? I would think it should be, you know, a clock signal. | |
| Nov 30, 2012 at 4:14 | history | edited | Penghe Geng | CC BY-SA 3.0 |
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| Nov 30, 2012 at 4:05 | history | asked | Penghe Geng | CC BY-SA 3.0 |