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eejli
Joined: 24 Mar 2004
Posts: 114
Helped: 1
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 02 Feb 2006 6:31 VCO cannot start up with NanoSim/Powermill? |
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| I simulate the same LC VCO(2GHz) with hspice and smartSpice. The vco can start up without any .IC conditions. But when I use the same setup to powermill. The VCO cannot just oscillate. Anybody can help me on this. Thanks.
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cmos_dude
Joined: 16 Nov 2005
Posts: 85
Helped: 7
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03 Feb 2006 12:57 VCO cannot start up with NanoSim/Powermill? |
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I Think it is because of the Noise being taken into consideration while simulating.
I have used HSPICE and know that it takes noise considerations, which is why your VCO starts oscillating.But I cannot say how NanoSim/Powermill behave.
Please correct me if I am wrong.
Rgds
Cmos Dude
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eejli
Joined: 24 Mar 2004
Posts: 114
Helped: 1
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28 Feb 2006 1:40 VCO cannot start up with NanoSim/Powermill? |
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| NanoSim actually can oscillate but oscillate to a different wrong frequency. That means NanoSim did start-up the oscillator.
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alenhan
Joined: 27 Feb 2006
Posts: 17
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28 Feb 2006 3:39 VCO cannot start up with NanoSim/Powermill? |
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| maybe u need to set voltage to a certain node
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cmos_dude
Joined: 16 Nov 2005
Posts: 85
Helped: 7
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28 Feb 2006 10:45 Re: VCO cannot start up with NanoSim/Powermill? |
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| alenhan wrote: |
| maybe u need to set voltage to a certain node |
This would mean that you are trying to initialize certain nodes of the VCO ????
But how would that be implemented in the real life situation, ie after fabrication ?
Regards
CMOS DUDE
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