Hi, Can you tell me which Orcad version are you using. The best way to solve these problems are to upload your files and the calculation made.
need help to simulate oscillator in orcad
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12th April 2012 07:53 PM #1aries
need help to simulate oscillator in orcad
Please can any one help me in simulating an oscillator in orcad. I have designed an oscillator using opamp but its not working. i have als applied the initial conditions also but still its not working.
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26th May 2012 03:50 PM #2babar_ali
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Last edited by babar_ali; 26th May 2012 at 03:51 PM.
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26th May 2012 11:45 PM #3crutschow
Sometimes to get a oscillator started in simulation you need to add a little perturbation to simulate the noise in a real circuit. One way to do that is to add a short single pulse of current to the oscillator loop using a current source. (Don't use a voltage source since that will short the loop to ground.)
0Zapper
Curmudgeon Elektroniker
--Inside every little problem is a big problem trying to get out.--
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28th May 2012 09:16 AM #4Winterstone
If it is "not working" - perhaps it is not really an oscillator, which means: Does the circuit meet the oscillation condition (Barkhausen)? Show us your circuit diagram and you will get a definite answer.
Originally Posted by aries
Regarding Chrutschow`s remark: It is correct - however, of course you can also use a short voltage pulse, if it is applied to any node that is already grounded.0
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28th May 2012 09:39 AM #5kubeek
How do you apply a voltage pulse to a grounded node? Originally Posted by Winterstone
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28th May 2012 02:50 PM #6Winterstone
Is this a serious question? Originally Posted by kubeek
Of course, by lifting that node and to connect a one-sided grounded source to it.0
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28th May 2012 03:13 PM #7kubeek
Absolutely serisous, I understood it as applying voltage to a node that IS grounded. I think saying "... that was initially grounded" would be a lot clearer.
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28th May 2012 06:43 PM #8Winterstone
Was this really your understanding? I suppose you were able to read between the lines. I am not silly enough to connect a voltage source between ground and ground. But it seems that my knowledge of the english language should be improved. Originally Posted by kubeek
Nevertheless - thanks for replying.0
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28th May 2012 08:53 PM #9ronv
Attach the circuit. It will help
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