Frequency domain simulation in Pspice

Mar 11, 2006 3 Replies
E

Hi peaple,



I try to build pspice simulation to a curcuit which I designed in Orcad. The simulation should be in Frequency domain. In "Simulation settings" I selected AC sweep option, logarithmic(decade) AC sweep type.



Start F=10 End F=100k Points/Decade=100. Unfortunately the simulation is failed because of the following: no AC sources - AC sweep ignored.



But AC source is defined(Vsin) ! The only thing I think may be the problem is the AC source in the Orcade shematics has a defined frequency. Am I right ? How can I fix the problem ?



Thanks in advance,



Eli.



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J

"VSIN" isn't an AC source, it's a sine wave voltage source.

Use part "VAC" (although you can still use "VSIN" but add AC=1 in the selections).

Also make sure your .AC calls the source by its _reference_name_!

...Jim Thompson

| James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC\'s and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | It\'s what you learn, after you know it all, that counts.
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E

Dear Jim,

Thank you very much for your helpful advice. Now the problem is solved. But would you please explain me the meaning of the AC=1 selection ?

Best Regads,

Eli.

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J

Normalization... "1" = 0dB

For experiment sake, change to AC=0.1 and see what you get.

...Jim Thompson

-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | |

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| 1962 | It's what you learn, after you know it all, that counts.

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