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> Pspice Nodes Floating, Amplifier on pspice fails
logari84
Posted: September 15, 2011 10:57 am
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Hi all. I'm new to Pspice and I have this problem. I designed a simple circuit of an amplifier ( http://imagebin.org/172561 ) and I have a floating nodes message in simulation (nodes 1,2 and 3 floating).

Below is the code:

CASE2.1
* En generator
RNE A 0 16.56K
VES A 0 DC 0
HEN 1 3 VES 4K

* In generator
RNI B 0 16.56K
VIS B 0 DC 0
FIN 2 3 VIS 12

* Input
CIN 3 2 30P
GR 2 3 2 3 2U

* Output
EA 4 0 3 2 750

.END
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CoulombMagician
Posted: September 18, 2011 05:02 pm
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The quick and dirty thing to do is to place a 100Meg resistor between each floating node and ground.
It's your circuit, you're responsible for understanding it but this will get you past the simulator error.
Cheers.
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Sch3mat1c
Posted: September 19, 2011 07:50 pm
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Evidently you didn't connect your amplifier to anything. Place it as a subcircuit within a larger circuit and the error will go away.

Shunt resistors (such as the 100Meg suggested) can be assigned automatically with the RSHUNT option. Typical values are 0 (default, none) or 1e12 to 1e8. Note that shunt resistors will apparently ground floating sections of circuitry, suppressing the error (floating nodes, singular matrix, etc.) without addressing the root cause.

Tim


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Answering questions is a tricky subject to practice. Not due to the difficulty of formulating or locating answers, but due to the human inability of asking the right questions; a skill that, were one to possess, would put them in the "answering" category.
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logari84
Posted: October 05, 2011 08:40 am
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Thx a lot. That was helpfull.
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