| Electronics > Beginners |
| Clamping digital signal for noise protection |
| (1/1) |
| sean87:
I have a 5V signal which gets some noise because of a nearby coupling (it is hall sensor signal from a motor and the noise is I beleive the PWM switching into the motor for speed control). These spikes cause unwanted triggering of commutation. I have an RC filter in place but it does not help. The question is...clamping this using a zener diode would help or not? How can I effectively remove the noise you see in the picture? |
| Wimberleytech:
A schematic would certainly help in understanding the fundamental problem here. |
| David Hess:
Is it an analog or digital signal? I do not see how simple clamping will be helpful at all. Some advanced analog techniques where fast settling is desired use adaptive clamping for lack of a better term. If the RC filter did not work on your example, then either there is not enough or the noise is actually present somewhere else like the ground. |
| vk6zgo:
Don't clamp it, clip it, removing the noise. You then amplify it to the original level. This was how it was done in the old days. |
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