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divider self oscilation frequency (Read 3545 times)
raja.cedt
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divider self oscilation frequency
Nov 06th, 2011, 1:42am
 
hello all,
I have implimented high frequency Bicmos static divider (working @ 100GHz), it is working in transient but i want to simulate self-oscilation frequency of the oscilator, so i just biased the clock input, without appling the clock signal but i haven't seens oscilations. Can any one suggest me what the problem (my latch is working fine). I thought of posting schematic but it's a common CML master and slave flip-flop.

Thanks,
Raj.
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loose-electron
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Re: divider self oscilation frequency
Reply #1 - Nov 6th, 2011, 5:20am
 
Inject some noise into the system.
In a simulation no noise unless you define it.
No noise and most oscillators will sit at a center bias point.
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Jerry Twomey
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raja.cedt
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Re: divider self oscilation frequency
Reply #2 - Nov 6th, 2011, 5:32am
 
hello  loose-electron,
yes you are correct, i used to keep some intial condition for oscilations by default.


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Raj.
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loose-electron
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Re: divider self oscilation frequency
Reply #3 - Nov 6th, 2011, 5:35am
 
happy to help
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Jerry Twomey
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raja.cedt
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Re: divider self oscilation frequency
Reply #4 - Nov 12th, 2011, 9:46am
 
hello loos-electron,
I did PSS for the divider, it showing 30GHz. Did you observe this any time, in transient it is not working with a stimulus..any guess on this?

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Raj.
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loose-electron
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Re: divider self oscilation frequency
Reply #5 - Nov 14th, 2011, 10:06am
 
would need to know more specifics about your circuit, test conditions and simulation setup
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Jerry Twomey
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