Floating nodes in PSPICE even with ground connected

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anandan111

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Hello all!
I am working on my project called 'waveform selector'. I am trying to run a simulation of my circuit in PSPICE.
I have constructed the circuit in PSPICE schematics (please see attached) and I still find that there are floating nodes though I have connected the AGND (analog ground) component to my circuit. Kindly enlighten me on this issue.

Please see attached for error message, schematic and vpulse parameters.
take note the circuit I have constructed is when second switch from the top in "ON".
I have done so because I do not know which switch I should use.
 

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  • Message.png
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  • switch2.png
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  • vpulse settings.png
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  • waveform selector schematic.png
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The upper node of C4 has no dc path to ground (resp. to a voltage source).
Recommendation: Use a large-valued resistor (1E10) across the capacitor.
 

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LvW said:
The upper node of C4 has no dc path to ground (resp. to a voltage source).
Recommendation: Use a large-valued resistor (1E10) across the capacitor.
Click to expand...

Thank you for your reply.
When you say across you mean parallel to capacitor C4 right? I have placed a 10 G ohm resistor across it.

I have attached the revised circuit with its output. I am unsure if this is the desired output I should get since in my lab I got something like a sine wave. Is the output I selected correct?
I have also included the schematic. The switch which I turn on now is the second switch from the top
 

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  • revised.png
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  • revised_output.png
    13.1 KB · Views: 78
  • waveform selector schematic.png
    45.3 KB · Views: 142

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