table of laplace and z transforms
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1/11/12 Table of Laplace and Z Transforms
1/2lpsa.swarthmore.edu/LaplaceZTable/LaplaceZFuncTable.html
Table of Laplace and Z Transforms
Laplace and Z Transforms Laplace Properties Z Xform Properties
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).
Entry Laplace Domain Time Domain (note)Z Domain
(t=kT)
unit impulse unit impulse
unit step (note)
ramp
parabola
tn
(n is integer)
exponential
power
time multiplied
exponential
Asymptoticexponential
doubleexponential
asymptoticdouble
exponential
asymptoticcriticallydamped
differentiatedcriticallydamped
sine
cosine
decayingsine
decayingcosine
genericdecayingoscillatory
genericdecayingoscillatory(alternate)
(note)
Z-domaingeneric
decayingoscillatory
(note)Prototype Second Order System (ζ<1, underdampded)
Prototype
2nd orderlowpass
step response
1/11/12 Table of Laplace and Z Transforms
2/2lpsa.swarthmore.edu/LaplaceZTable/LaplaceZFuncTable.html
Prototype
2nd
orderlowpassimpulse response
Prototype
2nd
orderbandpassimpulse response
Using this table for Z Transforms w ith 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 afunction:
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
References
© Copyright 2005-2011 Erik Cheever This page may be freely used for educational purposes.Comments? Questions? Suggestions? Corrections?
Erik Cheever Department of Engineering Swarthmore College
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