Brain Running Slow This A.M. - Time Delay from Laplace ??

Given your first post, I would have answered as Mr. Gaddi did. However, it seems now that you want either group delay or phase delay. Since phase delay is pretty obvious, I'm guessing it's group delay that you want. Given the Laplace transfer function, F(s), substitue j*w for s, then take the derivative of phase with respect to w. That is group delay. (Pronounce 'w' as omega.)

That's how to INSERT delay.

Given F(s), what's the time delay versus omega?

...Jim Thompson

-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | |

Thanks! It's coming back to me.. d(phase)/d(omega)

...Jim Thompson

IIRC, L{y(t - d)} = Y(s) * e^(-ds)

But I build only anticipatory circuits ;-)

...Jim Thompson

don't forget the negative sign!:

-dø GD = ---- dw

No, but they're _this close_.

Mark L. Fergerson