Hello,
i basically want to change the value of the resistor over time, to simulate an MR Sensor.
with LTSpice No Problem see below: resisor gets multipied with sine source
now i struggle with pspice to get the same job done -> i want later include my pspice model in matlab for post processing as well to speed up the requency of the resistor change.
i tried several syntax for R2 {}, also now i included a current source to have the same dimensions (R=U/I). but nothing worked so far. i've spend already hours and searched the world wide web.... nothing. Maybe some of you guys can give me a hint. -> would be great to have the same formula like {2k+1k*V(V2)} for R2. Hopefully this is only a syntax error. if i put for R2 {10k-5k} everything works. But with voltage as input-> there is an error
* Profile Libraries :
* Local Libraries :
* From [PSPICE NETLIST] section of U:\cdssetup\OrCAD_PSpice\17.2.0\PSpice.ini file:
.lib "nom.lib"
*Analysis directives:
.TRAN 0 1 0 1m
.OPTIONS ADVCONV
.PROBE64 V(alias(*)) I(alias(*)) W(alias(*)) D(alias(*)) NOISE(alias(*))
.INC "..\SCHEMATIC1.net"
**** INCLUDING SCHEMATIC1.net ****
* source TEST
V_V1 V1 0 5
R_R2 V1 OUT {1k+1K+V(V2)/I(I_I1)}
---------------------$
ERROR(ORPSIM-16318): Missing or invalid expression
R_R3 OUT 0 5k
V_V2 V2 0 AC 0
+SIN 0 1 2 0 0 0
I_I1 I1 0 DC 1A
**** RESUMING Sim1.cir ****
.END
Copyright © 2020 Cadence Design Systems, Inc. All rights reserved.
Hi,
To model a non linear resistor or voltage controlled resistor in pspice you can directly use the part "ZX" from ANL_MISC.olb library.
It is a subckt whose defination can be found out in anl_misc.lib also stated below.
.subckt zx 1 2 3 4 5
eout 4 6 poly(2) (1,2) (3,0) 0 0 0 0 1
fcopy 0 3 vsense 1
rin 1 2 1G
vsense 6 5 0
.ends
In image shown below, V4 will be multiplied with the Resistance value provided for R2.
Between Pin 4 and pin 5 you will get required resistance value based on V4 and R2 input.
Hope it will help.
Hello Ashish,
thank you very much.
i also tried this one out. Multiplikation works.
But how i can take the floating Z output to make a summation/ subtraction with "R5" and "R6"
Is there a shorter way like that: R5: Value = {5k+1.5k*V3} -> V3 is Sine voltage.
Hello Vitali,
In pspice there is no shorter way like you mentioned R5: Value = {5k+1.5k*V3} -> V3 is Sine voltage.
But I assume the performing addition and subtraction will work in the way shown below
It wll be a 2 step process
Step 1-->For addition just put the resistor in series with Z impedance
Step2 -->For subtraction also put the resistor in series with Z impedance ( having source interchanged to negative pin)
This will give correct amplitude for both addition and subtraction.
Holy Moly! It worked!!
Thank you very much.
i would never thought of that complex setup ;)
V6 i didn't use since i could also take V4 as input X2 Pin 2.
Thanks again :)
now you made one person more happy -> You can add an additional stroke on your tally sheet regarding "how many people made i happy" :)
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In PSpice, you cannot directly reference voltage nodes in resistor expressions as geometry dash online you would in LTSpice. PSpice does not support this kind of dynamic resistor behavior out of the box.