Pspice simulation in orcad 16 version for designing various components

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indiraji

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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 .
Click to expand...

pls help me in resolving it..
 

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

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
 
Last edited by a moderator:

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

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


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?
 

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
 

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
 

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
 

i get the same error as before
Click to expand...
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 .
 

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

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

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

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

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 ....
 

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

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
 

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