Using this table for Z Transforms with Discrete Indices
Shortened 2-page pdf of Laplace Transforms and Properties
Shortened 2-page pdf of Z Transforms and Properties
All time domain functions are implicitly=0 for t<0 (i.e. they are multiplied by unit step).
Shortened 2-page pdf of Laplace Transforms and Properties
Shortened 2-page pdf of Z Transforms and Properties
All time domain functions are implicitly=0 for t<0 (i.e. they are multiplied by unit step).
| Entry | Laplace Domain | Time Domain (note) | Z Domain (t=kT) |
|---|---|---|---|
| unit impulse | |||
| unit step | |||
| ramp | |||
| parabola | |||
| tn (n is integer) | |||
| exponential | |||
| power | |||
| time multiplied exponential | |||
| Asymptotic exponential | |||
| double exponential | |||
| asymptotic double exponential | |||
| asymptotic critically damped | |||
| differentiated critically damped | |||
| sine | |||
| cosine | |||
| decaying sine | |||
| decaying cosine | |||
| generic decaying oscillatory | |||
| generic decaying oscillatory (alternate) | |||
| Z-domain generic decaying oscillatory | (note) | ||
| Prototype Second Order System (ΞΆ<1, underdampded) | |||
| Prototype 2nd order lopass step response | |||
| Prototype 2nd order lopass impulse response | | | |
| Prototype 2nd order bandpass impulse response | | ||
Using this table for Z Transforms with discrete indices
Commonly the "time domain" function is given in terms of a discrete index, k, rather than time. This is easily accommodated by the table. For example if you are given a function:Since t=kT, simply replace k in the function definition by k=t/T. So, in this case,
and we can use the table entry for the ramp
The answer is then easily obtained
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