Pspice simulation in orcad 16 version for designing various components

indiraji · May 19, 2014

i have written the pspice model for designing thermistor and attached to the component designed. after this when i try to use the part in the circuit and simulate it i get error like

SUBCKT NTC used by u1_x is undefined .

pls help me in resolving it..

johnjoe · May 19, 2014

Post your model file please and your netlist of your design.

indiraji · May 20, 2014

This is my pspice model for thermistor:

Code:

.subckt THERMISTOR 1 2 Params: T0=25, R0=1000, B=3892
Btherm 1 3 V = I(Vsense)*(R0)*EXP(B*((1/(V(TEMP)+273))-(1/(T0+273)))))
Vsense 3 2 DC 0
.ends

MY NETLIST GENERATED

.PROBE64 V(alias(*)) I(alias(*)) W(alias(*)) D(alias(*)) NOISE(alias(*))
.INC "..\SCHEMATIC1.net"

**** INCLUDING SCHEMATIC1.net ****
* source CCK
X_U1 N004660 N004661 C619_22000 PARAMS: TOL=0
V_V1 N004660 0 DC 5Vdc AC 1Vac
R_R1 0 N004661 1k TC=0,0

**** RESUMING nara.cir ****
.END

ERROR(ORPSIM-15108): Subcircuit NTC used by X_U1.X1 is undefined

johnjoe · May 20, 2014

As you created your symbol, did you used the word "NTC" somewhere? Or just rename "THERMISTOR" into "NTC".

indiraji · May 20, 2014

johnjoe said:
As you created your symbol, did you used the word "NTC" somewhere? Or just rename "THERMISTOR" into "NTC".

As i am new to orcad pspice ...pls explain me your statement. and did u check my pspice model ...? is that enough for a thermistor?

johnjoe · May 20, 2014

Code:

.subckt THERMISTOR 1 2 Params: T0=25, R0=1000, B=3892
Btherm 1 3 V = I(Vsense)*(R0)*EXP(B*((1/(V(TEMP)+273))-(1/(T0+273)))))
Vsense 3 2 DC 0
.ends

->

Code:

.subckt NTC 1 2 Params: T0=25, R0=1000, B=3892
Btherm 1 3 V = I(Vsense)*(R0)*EXP(B*((1/(V(TEMP)+273))-(1/(T0+273)))))
Vsense 3 2 DC 0
.ends

indiraji · May 21, 2014

ya altered it when i again simulated i got error like this

**** INCLUDING SCHEMATIC1.net ****
* source SIMULATION1
R_R1 0 N00322 1k TC=0,0
I_I1 N00313 0 DC 1Adc
X_T1 N00313 N00322 THERMISTOR PARAMS: T0=25, R0=1000, B=3892

**** RESUMING simulate.cir ****
.END

**** EXPANSION OF SUBCIRCUIT X_T1 ****
X_T1.Btherm N00313 X_T1.3 X_T1.V X_T1.I Vsense
----------------------------------------$
ERROR(ORPSIM-16147): Invalid parameter
what is the error here... i suppose the error is in my pspice model... pls help me

FvM · May 21, 2014

Code:

Btherm 1 3 V = I(Vsense)*(R0)*EXP(B*((1/(V(TEMP)+273))-(1/(T0+273)))))

You are trying to use LTSpice private behavioral syntax in PSpice. Review the PSpice reference for legal behavioral expressions. They should use a E controlled source, if I remember right.

indiraji · May 21, 2014

FvM said:
Code:

Btherm 1 3 V = I(Vsense)*(R0)*EXP(B*((1/(V(TEMP)+273))-(1/(T0+273)))))

You are trying to use LTSpice private behavioral syntax in PSpice. Review the PSpice reference for legal behavioral expressions. They should use a E controlled source, if I remember right.

k i agree.. i tried simulating memristor pspice model

Code:

.SUBCKT memristor 1 2 6
Eres	1	9	POLY(2)	(8,0)	(10,0)  0 0 0 0 1
Vsense	9	4	DC 0v
Fcopy	0	8	vsense 1
Rstep	8	0	1k
Rser	2	4	10
Gmem 6 0 VALUE={I(Vsense)*max(v(6,0)*(1-v(6,0)), 0)}
Cmem 6 0 50nf
Ecpy   6 0 VALUE={min(max(v(6,0),0),1)}
Rsp	6	0	1000Meg
.ENDS

i get the same error as before

Code:

**** INCLUDING SCHEMATIC1.net ****
* source SIMU2
R_R1         N00149 0  1k TC=0,0 
V_V1         N00140 0  
+SIN 0 1Vdc 500hz 0 0 0
R_R2         N001821 N00323  1G TC=0,0 
V_V2         N001821 0 0.5Vdc
X_M1         N00140 N00149 N00323 MEMRISTOR

**** RESUMING mem.cir ****
.END

ERROR(ORPSIM-15108): Subcircuit MEMRISTOR used by X_M1 is undefined

Please do someone help me in writting pspice model for thermistor...pls

FvM · May 21, 2014

i get the same error as before

Apparently you had been able to resolve this error later on, otherwise post #7 would never have been written. So I presume you know how to import subcircuits correctly.

Regarding the "invalid parameter" error in post #7, the memristor subcircuit shows how behavioral circuits can be described in PSpice.

indiraji · May 21, 2014

FvM said:
Apparently you had been able to resolve this error later on, otherwise post #7 would never have been written. So I presume you know how to import subcircuits correctly.

Regarding the "invalid parameter" error in post #7, the memristor subcircuit shows how behavioral circuits can be described in PSpice.

ya after importing the subcircuits correctly for memristor . Now am getg this error

Code:

**** INCLUDING SCHEMATIC1.net ****
* source SIMU2
R_R1         N00149 0  1k TC=0,0 
V_V1         N00140 0  
+SIN 0 1Vdc 500hz 0 0 0
R_R2         N001821 N00323  1G TC=0,0 
V_V2         N001821 0 0.5Vdc
X_M1         N00140 N00149 N00323 MEMRISTOR

**** RESUMING mem.cir ****
.END

ERROR(ORPSIM-15141): Less than 2 connections at node X_M1.10.

ERROR(ORPSIM-15142): Node X_M1.10 is floating

i guess somethng goes wrong in my circuit ...pls explain me wr should i correct n wat .

johnjoe · May 21, 2014

Can you compress and upload your whole project, maybe I can check, it's much easier in the program?

indiraji · May 21, 2014

johnjoe said:
Can you compress and upload your whole project, maybe I can check, it's much easier in the program?

View attachment simulation1-PSpiceFiles.rar View attachment simulation1-PSpiceFiles.rar

pls tel if u have any link to learn how to write pspice model for various component

thank you

johnjoe · May 22, 2014

You didn't uploaded the whole project, please upload again and make sure the *.obj and your model is included.

indiraji · May 22, 2014

johnjoe said:
You didn't uploaded the whole project, please upload again and make sure the *.obj and your model is included.

View attachment simulation1-PSpiceFiles.rar

pls explain me this
less than 2 connections at node in7964
the node is floating

thank you

johnjoe · May 22, 2014

I took your design, made a symbol of your model and run simulation without errors.

indiraji · May 22, 2014

johnjoe said:
I took your design, made a symbol of your model and run simulation without errors.

then y am nt able to do . i am using orcad 16.6 version (student version). can u pls help me out in this... r u getg dc sweep graph...?

- - - Updated - - -

Code:

**** EXPANSION OF SUBCIRCUIT X_U1 ****
X_U1.Etherm N000360 X_U1.3 X_U1.V X_U1.I Vsense
-----------------------------------------$
ERROR(ORPSIM-16152): Invalid number

now am getg this error .

and my subckt used is

Code:

.subckt TH 1 2 Params: T0=25, R0=1000, B=3892
Etherm 1 3 V = I(Vsense)*(R0)*EXP(B*((1/(V(TEMP)+273))-(1/(T0+273)))))
Vsense 3 2 DC 0
.ends

pls do help me ....

johnjoe · May 22, 2014

Upload please again this project, you showed in your last post, because the previous uploaded project looks different.

indiraji · May 23, 2014

you told u have simulated my project which was previously posted with out any error rite.. for thermistor...that ly i am tryg with different codes... so u just tell me where am i gng wrong...n in what kind of circuit u implemented the component? can u upload ur circuit file? pls giv me some links to learn how to write pspice module for each components .
Thank you

johnjoe · May 24, 2014

I'll post it tomorrow.

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