AC coupled sinewave

by todiOdi   Last Updated September 11, 2019 17:25 PM

How can I see in this picture that the signals are AC coupled? Does not AC coupled means that the DC offset is 0 and the sine is centered to the origin? Both signals have an offset from what I can see here.

enter image description here



Answers 1


How can I see in this picture that the signals are AC coupled?

You can't. We can see that both signals have zero mean, but we can't tell why that might be. AC coupling could explain it.

Does not AC coupled means that the DC offset is 0 and the sine is centered to the origin?

Yes, the peaks of a sine wave would be centered on the origin.

Both signals have an offset from what I can see here.

These are obviously not sine waves. But they do appear to be exact complements of each other, and they cross each other exactly at zero on the vertical axis. Therefore, there is no common-mode signal. This means either of two things:

  • Neither signal has a DC offset. (the simplest case)
  • Both signals have a DC offset, and the offsets exactly cancel each other. (unlikely)
Dave Tweed
Dave Tweed
September 11, 2019 18:17 PM

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