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How to implement a biphasic asymmetric waveform?
Posted Feb 11, 2013, 5:39 p.m. EST Materials 5 Replies
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Here is the information for the 4 channel electrical stimulator settings:
Channels 1+2 output as one biphasic waveform:
Channel 1:
-- Pulse width = 0.160 msec
-- Pulse period = 10 msec
-- Amplitude = 10 V
Channel 2:
-- Pulse width = 5 msec
-- Pulse period = 10 msec
-- Amplitude = -0.32 V
Channels 3+4 output as one biphasic waveform:
Channel 3:
-- Pulse width = 5 msec
-- Pulse period = 10 msec
-- Amplitude = 0.32 V
Channel 4:
-- Pulse width = 0.160 msec
-- Pulse period = 10 msec
-- Amplitude = -10 V
I look forward to hearing from anyone who may be of some help for me on this topic. Thanks again!
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I might not have really understood you, but in Definitions functons "rect" the rectangle function should allow you to define pulse width rise/fall time, amplitude, the with an analytical function calling this rect you can make it "periodic" (perhaps also directly with the rect, check the "sub tabs" I'm not by my COMSOl workstation.
You reeat the same for the second pulse, and then you call the different ports with a +/-ana1(t[1/s]) or +/-rect1(t[1/s]) and that should work, ... no ?
--
Good luck
Ivar
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Thank you for your response. I tried using rectangle functions; however, there was no way that I could find in which to change the amplitude. I was able to change the pulse width and rise/fall time though.
After thinking about what you had said, I ended up using a series of step functions that I than added together in an analytic function. When I generate the plot, the waveform appears to be correct. Thanks for your help.
Best regards,
Eric
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you can either multiply your rect1(...) function something like A0*rect1(...), or you could add an analytical function where you add the amplitude and call the rect1(...) function
--
Good luck
Ivar
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Can you please help me in creation of new waveform. I would like to create a step function waveform to use it in analytic expression. We have only square, triangular, sawtooth and sine function wave forms in comsol. But I would like have only positive step function.
How can I create it. I tried in create plot, but I could not able to simulate it. Can you please help me out.
Thanking you.
Meera kunden
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I came to know that you were looking for ways to generate a positive step function waveform on the forum and i am working on a similar project.
Have you been able to generate it?
Would you like to share your knowledge?
Warm regards,
Nikita Bansal