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Allegro Design Entry CIS - floating node problem

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Ricardo Peterson

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Hello,

I am currently using Allegro Design Entry CIS, and I'm rather new to it.
I built a double pulse test circuit but I am having trouble simulating it. I created a new simulation profile and ran a transient analysis to 15us with a max step size of 10ns.

Upon simulating the circuit (and I'm not expecting correct results the first time), I get all of these floating nodes. My circuit is grounded as you can see in the schematic I attached here.

Any thoughts? Here are the floating node errors

**** 06/30/13 13:32:00 ***** PSpice 16.6.0 (October 2012) ***** ID# 0 ********

** Profile: "SCHEMATIC1-sim1" [ C:\USERS\RICARDO\DROPBOX\REU\CADENCE\Run2\simulation 2-PSpiceFiles\SCHEMATIC1\sim1.sim ]


**** CIRCUIT DESCRIPTION


******************************************************************************




** Creating circuit file "sim1.cir"
** WARNING: THIS AUTOMATICALLY GENERATED FILE MAY BE OVERWRITTEN BY SUBSEQUENT SIMULATIONS

*Libraries:
* Profile Libraries :
* Local Libraries :
* From [PSPICE NETLIST] section of C:\Users\Ricardo\AppData\Roaming\SPB_Data\cdssetup\OrCAD_PSpice/16.6.0/PSpice.ini file:
.lib "nom.lib"

*Analysis directives:
.TRAN 0 15u 0 10n
.OPTIONS ADVCONV
.PROBE64 V(alias(*)) I(alias(*)) W(alias(*)) D(alias(*)) NOISE(alias(*))
.INC "..\SCHEMATIC1.net"



**** INCLUDING SCHEMATIC1.net ****
* source SIMULATION 2
V_V3 N03321 N03960
+PULSE -2 20 2u 10n 10n 8u 2000u
V_V1 N03029 GND_POWER 800Vdc
R_R2 N03787 N03029 1 TC=0,0
V_V2 N03960 GND_POWER
+PULSE 0 22 12u 10n 10n 2u 2000u
C_C1 GND_POWER N03787 2m TC=0,0
L_L1 N03329 N03713 856uH
R_R1 N03029 N03129 0.5 TC=0,0
R_R3 N03713 N03129 0.3 TC=0,0
R_R4 N03321 N03994 6 TC=0,0
D_D1 N03329 N03129 D10D2

**** RESUMING sim1.cir ****
.END

ERROR(ORPSIM-15141): Less than 2 connections at node N03994.

ERROR(ORPSIM-15142): Node N03321 is floating

ERROR(ORPSIM-15142): Node N03960 is floating

ERROR(ORPSIM-15142): Node N03029 is floating

ERROR(ORPSIM-15142): Node GND_POWER is floating

ERROR(ORPSIM-15142): Node N03787 is floating

ERROR(ORPSIM-15142): Node N03329 is floating

ERROR(ORPSIM-15142): Node N03713 is floating

ERROR(ORPSIM-15142): Node N03129 is floating

ERROR(ORPSIM-15142): Node N03994 is floating
Click to expand...

Capturetotal.jpg

- - - Updated - - -

Okay so I got it fixed, except for this error:
ERROR(ORPSIM-15141): Less than 2 connections at node N03994.


:/
 

Likely you have these problems:
- wrong ground symbol, not connected to node "0"
- transistor Q1 is missing from the netlist, probably a symbol without SPICE template

Both problems have been discussed in various previous threads

Obviously PSpice with Orcad schematic entry isn't well suited for beginners. I never heard about similar problems with the old PSpice schematic editor or tools like LTSpice.
 

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