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## Main Question or Discussion Point

Hi.

I get a signal from an acclereometer that I integrate using an op-amp to get the velocity. But the problem is that this signal is phase shiftet 90 degree.

Because I'm supposed to compare this signal with a reference signal that is 180 degree phase shiftet, and now I'm getting wrong values.

Anyone know an easy way to phase shift this 90 degrees more, so that the total phase shift is 180?

I get a signal from an acclereometer that I integrate using an op-amp to get the velocity. But the problem is that this signal is phase shiftet 90 degree.

Because I'm supposed to compare this signal with a reference signal that is 180 degree phase shiftet, and now I'm getting wrong values.

Anyone know an easy way to phase shift this 90 degrees more, so that the total phase shift is 180?