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Pspice to IsSpice4 Conversion
Transformer for Flyback converter: Calculation example. Transformer for Forward converter:Calculation example. The available shapes include bars, toroids, EE EI and UI cores. The Curie temperature TC, namely the temperature at which the material loses its ferromagnetic properties, is between 100 and 300 ° C, depending on the type of. Apr 18, 2015 LTSpice and PSpice have common roots, so everything I show here should work there. Note I plot the thermistor resistance,:the expression (V(d)-V(b))/I(R3) = Rt is in Ohms, and is plotted vs degC. The current in R12 is what this circuit varies with temperature.
- Oct 15, 2012 Hi guys I have a LTspice circuit and I would like to have it run in PSpice. Can anyone help convert it please. All About Circuits. Home Forums > Circuits and Projects > The Projects Forum > Convert from LTspice to PSpice Reply to Thread. Discussion in 'The Projects Forum. How to convert a Pspice model to LTspice Posted by njk381 in forum.
- May 13, 2014 steps the global temperature from -40 °C to +20 °C in steps of 5 °. The local temperature can be set by attaching the temperature to the device's value, see figure 1: Figure 1: 100kOhm, tc=50ppm, Temp=100 °C In this example the resistor is 100kOhm at 27 °C (the default temperature for LTSPICE).
- Parameters for setting temperature 51 Model parameters for device temperature 51 Examples 51. PSpice A/D digital simulation condition messages 61.PARAM (parameter) 63.PLOT (plot) 64. Multi-bit A/D and D/A converter 292 Multi-bit analog-to-digital converter 293.
- Using PSpice to Simulate the Discharge Behavior of Common Batteries 265 E_Rate is the sensed discharge current in Amps divided by the Amp-hour capacity of the cell. The node, RATE, is the instantaneous rate at which the cell is being discharged (see Figure146). This instantaneous rate information can almost be fed directly to.
1) Look for all resistor .MODEL lines that look like:
.MODEL <model_name> RES ..
In these lines the type of the model must be changed from RES to R.
Convert them according to the following rule:
.MODEL <model name> RES ..
.MODEL RMOD RES TC1 = 0.002
IsSpice model:
.MODEL <model_name> R ..
.MODEL RMOD R TC1 = 0.002
2) Look for all lines starting with the letter 'R'. They should look like:
R<name> <node_1> <node_2> <model_name> <resistance_value> ..
Here, the ordering of the model name and resistance value must be swapped.
The conversion rule is:
Pspice model:
R<name> <node_1> <node_2> <model_name> <resistance_value> ..
Rd 1 10 RMOD 1K TEMP=25
IsSpice model:
R<name> <node_1> <node_2> <resistance_value> <model_name> ..
Rd 1 10 1K RMOD TEMP=25
3) Look for .MODEL lines containing the T_MEASURED parameter:
.MODEL <model_name> <model_type> .. T_MEASURED = <value> ..
Download Ltspice Models
The T_MEASURED parameter must be renamed to TNOM:
Pspice model:
.MODEL <model_name> <model_type> .. T_MEASURED = <value> ..
.MODEL DLMOD D IS = 1E-012 T_MEASURED = 25 N = 2
IsSpice model:
.MODEL <model_name> <model_type> .. TNOM = <value> ..
.MODEL DLMOD D IS = 1E-012 TNOM = 25 N = 2
4) Look for .model lines containing the T_ABS parameter:
.MODEL <model_name> <model_type> T_ABS = <temp_value> ..
The T_ABS parameter must be renamed to TEMP and moved to the instance line that calls the .model.
Change the instance and the model line according to the following rule:
Pspice model:
<instance_name> .. <model_name>
.MODEL <model_name> <model_type> T_ABS = <temp_value> ..
Ddg 25 24 ddgmod
.model ddgmod d t_abs = 25 is = 1E-024 cjo = 3.97482E-010 vj = 0.289018 m = 0.284643 fc = 1E-006
IsSpice model:
<instance_name> .. Emachines et1161 07 motherboard. <model_name> TEMP = <temp_value>
.MODEL <model_name> <model_type> ..
Import Pspice Model Into Ltspice
Ddg 25 24 ddgmod temp = 25
.model ddgmod d is = 1E-024 cjo = 3.97482E-010 vj = 0.289018 m = 0.284643 fc = 1E-006
Note that the .MODEL line you are looking for may occur before the instance line that addresses it.
Netlists are insensitive to the ordering of instance and MODEL lines.
5) Look for .model lines containing vswitch:
.model <model_name> vswitch ron=??? roff=??? von=??? voff=???
| Change the device type from vswitch to sw. Use the same RON and ROFF parameters, but replace VON and VOFF with VT and VH calculated as follows: |
|
Pspice model
.model smod vswitch ron=.1m roff=1e15 von=-1.19 voff=-1.21
IsSpice model
.model smod sw ron=.1m roff=1e15 vt=-1.2 vh=.01
6) Convert G and E tables
G tables become:
Pspice model
G1 3 4 table {v(1,2)}=(..{table values}..)
IsSpice model
AG1 %vd(1,2) %id(3,4) tmod
.model tmod pwl
+ fraction = FALSE,input_domain=0.0, xy_array = [..{table values}..]
E tables become:
Pspice model
E1 3 4 table {v(1,2)}=(..{table values}..)
IsSpice model
AE1 %vd(1,2) %vd(3,4) tmod
.model tmod pwl
+ fraction = FALSE,input_domain=0.0, xy_array = [..{table values}..]
7) Convert E/G/S elements and equations to B element equations
For E/G elements:
Pspice model
gout 101 102 VALUE={V(201,202)*i(vsense)}
etmax tmax 0 value={Tr*v(tm1) + (Ts-Tr)*v(tm2)}
IsSpice model
Bgout 101 102 I=V(201,202)*i(vsense)
Betmax tmax 0 v={Tr}*v(tm1) + {(Ts-Tr)}*v(tm2) ; see how {} went around Ts-Tr
- AddB to beginning of line
- Replace VALUE with V for e source and I for g source
- Removecurly braces before and after expression
- Place curly braces around one or more parameters that can be evaluated.
Be careful not to mix nodes and parameters in expressions.
For S elements:
Pspice model
s1 1 2 201 0 switch
IsSpice model
As1 1 2 201 0 switch
- Add A to beginning of line
8) Convert IF-THEN-ELSE syntax:
Pspice model
Format: IF(argument,then,else)
E1 1 0 Value = { IF ( V(3) > 5, 10, 100m ) }
E1 1 0 Value = { IF (V(3) > 5, 5, IF ( V(3) < 100m, 100m, V(3) ) ) };nested if-then-else
Format: | EVALUATION?OUTPUT_VALUE1 or EXPRESSION :OUTPUT_VALUE2 or EXPRESSION |
ifEVALUATION is true thenOUTPUT_VALUE1elseOUTPUT_VALUE2 |
BE1 1 0 V = V(3) > 5 ? 10 : 100m
BE1 1 0 V = V(3) > 5 ? 5 : V(3) < 100m ? 100m : V(3) ;nested if-then-else
9) Analog Behavioral In-line Equations, Expressions, and Functions:
Note: IsSpice4 uses B-elements and Pspice uses G-element or E-elements with keyword Value=. See item 7 above. This is only a list of Pspice syntax and the IsSpice4 equivalent. IsSpice has a lot more functions which you can read about in the IsSpice4 User's Guide. To make it easier to read I highlight in red what is different or not supported.
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| Pspice syntax | IsSpice syntax | |
| addition | + | + |
| subtraction | - | - |
| multiplication | * | * |
| division | / | / |
| exponentiation | ** | ^ |
| unary NOT | ~ | ~ |
| boolean OR | ||
| boolean XOR | ^ | ---not supported--- |
| boolean AND | & | & |
| equality test | ---not supported--- | |
| non-equality test | != | ---not supported--- |
| greater than test | > | > |
| greater than or equal to test | >= | >= |
| less than test | < | < |
| less than or equal to test | <= | <= |
| x | ABS(x) | ABS(x) |
| x1/2 | SQRT(x) | SQRT(x) |
| ex | EXP(x) | EXP(x) |
| ln(x) | LOG(x) | ln(x) |
| log(x) | LOG10(x) | log(x) log10(x) |
| x y | PWR(x,y) | PWR(x,y) |
| + x y (if x > 0) - x y (if x < 0) | PWRS(x,y) | PWRS(x,y) |
| sin(x) | SIN(x) | SIN(x) |
| sin-1(x) | ASIN(x) | ASIN(x) |
| sinh(x) | SINH(x) | SINH(x) |
| cos(x) | COS(x) | COS(x) |
| cos-1(x) | ACOS(x) | ACOS(x) |
| cosh(x) | COSH(x) | COSH(x) |
| tan(x) | TAN(x) | TAN(x) |
| tan-1(x) | ATAN(x) ARCTAN(x) | ATAN(x) |
| tan-1(y/x) | ATAN2(y,x) | ATAN2(y,x) |
| tanh(x) | TANH(x) | TANH(x) |
| magnitude of x | M(x) | M(x) mag(x) magnitude(x) |
| phase of x | P(x) | P(x) ph(x) phase(x) |
| real part of x | R(x) | R(x) re(x) real(x) |
| imaginary part of x | IMG(x) | IMG(x) im(x) imag(x) |
| time derivative of x | DDT(x) | ---not supported--- |
| time integral of x | SDT(x) | ---not supported--- |
| y value as a function of x | TABLE(x,x1,y1,..) | Use Code Model (See item 6 above) |
| minimum of x and y | MIN(x,y) | MIN(x,y) |
| maximum of x and y | MAX(x,y) | MAX(x,y) |
| limit (x,min,max) | LIMIT(x,min,max) | ---not supported--- |
| +1 if x > 0 0 if x = 0 -1 if x < 0 | SGN(x) | SGN(x) |
| 1 if x > 0 0 otherwise | STP(x) | STP(x) |
| x if t is true y otherwise | IF(t,x,y) | t ? x : y |
Hi to all,
i'm a new member and my english isn't very good, sorry..
I need to create a circuit to convert 0-50mA to 0-3.3V, using a 741 op amp for my university. We want to use an opamp as a transresistance amplifier.
When i try my circuit on the pspice simulator the ua741 saturates..probably my circuit isn't good or i have to add other elements in my circuit.
We use the Orcad 9.1 Student version for our simulations.
So:
In input we have a current DC in the order of mA.
In output we want a voltage max of 3.3V .
If anybody could show me a circuit using a 741 op amp to achieve the above I would be greatly appreciative!!
i'm a new member and my english isn't very good, sorry..
I need to create a circuit to convert 0-50mA to 0-3.3V, using a 741 op amp for my university. We want to use an opamp as a transresistance amplifier.
When i try my circuit on the pspice simulator the ua741 saturates..probably my circuit isn't good or i have to add other elements in my circuit.
We use the Orcad 9.1 Student version for our simulations.
So:
In input we have a current DC in the order of mA.
In output we want a voltage max of 3.3V .
If anybody could show me a circuit using a 741 op amp to achieve the above I would be greatly appreciative!!
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