Electronics > Projects, Designs, and Technical Stuff
LTSpice pulse options
Simon:
I am trying to experiment with analysing square waveforms with FFT in LTSpice by analysing the pulse waveforms with various rise and fall times. But there seems to be a minimum rise time of 50µs. Even if I set rise and fall times to "0" I get a slope of about 50µs. Is this how it works?
T3sl4co1l:
A zero, null or absent parameter, that must be nonzero, is simply given its default value.
Tim
Simon:
Well in theoretical land a 0 rise/fall time can be done. So are you saying that 50µs is the fastest transition I am allowed or that it is the default because 0 is not acceptable?
Simon:
hm, setting 1ns I get practically straight edges.
Simon:
1ps produces a giberish waveform :)
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