Simulation Manager for OrCAD PSpice

Dalibor Biolek1,2, Jaroslav Kadlec1

1,2 Faculty of EE and Communications, Dept. of MicroelectronicsBrno University of Technology, Czech Republic

1 Faculty of Military Technologies, Dept. of EEUniversity of Defence, Brno, Czech Republic

Outline

•Why PSiM (PSpice Simulation Manager)

•PSiM Conception

•PSiM Features

•Demonstrations

•Conclusions

Why PSiM

OrCAD PSpice limitations:

•ICL (Interactive Command Language) is not implemented

•No possibility to work in so-called sequential mode

•Results of the analysis cannot be input data of the following analysis

circuit file PSpice analysis results

headernetlistcommands.end

output fileProbe files...

pspice.exe

psp_cmd.exe

user

PSiM Conceptioncircuit file PSpice analysis results

headernetlistcommands.end

output fileProbe files...

psp_cmd.exe

SIM

user

Manager Control File

header

commands

PSiM Conception

assemblycir x.cir

endassembly

...Rx 1 2...

...set variable=1...

.

...

...

Extended Circuit File

x.cir

data from .TRAN, .AC, .DC

data from bias points

run

Manager Control File (MCF)

(ECIR)

PSpice Circuit File(PCIR)

variable

re-defining the variables

x.dat

x.out

x.csd

x.bias

psp_cmd.exe

PSiM Features

•The PSiM reads the MCF step-by-step, starting from the first line.

•The programming language of the PSiM should support mathematical computations.

•The ECIRs of the circuits being analyzed can appear in the MCF.

•The PCIR can be modified prior to its generation by the PSiM.

•The PSiM is able to process the results of executed simulations.

•All the files generated from all executed simulation runs should be available.

•The PSiM manages commands for program loops and chaining.

PSiM Demonstrations

Optimization of transistor amplifier

Rc design in order to set voltage gain to 10 on a frequency of 1kHz

Vin

1Vac

Cv

10u

Rb1180k

Rb233k

Q1

Re200

Rc1.9k

Vbat12V

0

0

00

in bc

e

bat

2N2222

Preliminary PSpice analysis: The gain is approximately 9.

PSiM Demonstrations

Optimization of transistor amplifier

1: *transistor amplifier2: set Rc 1.9k gain 13: while (gain)<=104: assemblycir run.cir5: *beginspice6: Vbat bat 0 12V7: Q c b e Q2N22228: Rc bat c #$Rc$9: Re e 0 20010: Rb1 bat b 180k11: Rb2 b 0 33k12: Cv in b 10u13: Vin in 0 AC 114: .lib15: *endspice16: genFpoint AMPLI 1k {v([c])}17: endassembly18: getFpoint AMPLI gain 119: set Rc Rc+2020: endwhile

Vin

1Vac

Cv

10u

Rb1180k

Rb233k

Q1

Re200

Rc1.9k

Vbat12V

0

0

00

in bc

e

bat

2N2222

The analysis runs 11 times. Two last results (Rc, gain):

2100 Ohms, 9.997

2120 Ohms, 10.09

PSiM Demonstrations

AC analysis of SH circuit

v(t)

RC

v (t) v(t)

t

t

kT+T

kT+TkT

tv e1

tv e2

1 2 1 2 1 2 1 21 2 1 2

1

in

v (t) in

)()()( 1111 TkTvbkTvaTkTv in

)()()( 212 TkTvbTkTvaTkTv in

1,1/

2111

inTT VbzVaV

2,2/

1222

inTT VbzVaV

=0

PSiM Demonstrations

AC analysis of SH circuit

)()()( 1111 TkTvbkTvaTkTv in

)()()( 212 TkTvbTkTvaTkTv in

1,1/

2111

inTT VbzVaV

2,2/

1222

inTT VbzVaV

=0

For k=1..2 *computing coefficients bk circuit model in phase k, vin=1V, zero initial conditions TRANSIENT analysis, Tmax =Tk reading the state variable and saving it to the variable bk *computing coefficients ak circuit model in phase k, vin=0V, zero initial conditions the state variable v = 1 TRANSIENT analysis, Tmax=Tk reading the state variable and saving it to the variable akend

Algorithm of the MCF:

PSiM Demonstrations

AC analysis of SH circuit

)()()( 1111 TkTvbkTvaTkTv in

)()()( 212 TkTvbTkTvaTkTv in

1,1/

2111

inTT VbzVaV

2,2/

1222

inTT VbzVaV

=0

Compiling the z-domain equations via behavioral modeling (E-sources)

Solving equations via .AC analysis

PROBE demonstration of frequency responses

Algorithm of the MCF:

PSiM Demonstrations

AC analysis of SH circuit

1: *AC analysis of Sample-Hold circuit2: set Ron 5k fs 100k T1 0.1/fs T2 1/fs-T13: beginnet SH14: Ron 1 2 #$Ron$5: Rs 2 3 10m6: C 3 0 1n7: Rz 2 0 100k8: endnet9: beginnet SH210: Rs 2 3 10m11: C 3 0 1n12: Rz 2 0 100k13: endnet14: defsim tran1 .TRAN 0 #$T1$ 0 #$T1/100$ skipbp15: defsim tran2 .TRAN 0 #$T2$ 0 #$T2/100$ skipbp16: defsim AC .AC dec 100 10 #$fs*2$17: assemblycir run1.cir18: Vin 1 0 1V19: use SH120: runsim tran121: endassembly

PSiM Demonstrations

AC analysis of SH circuit

22: getprobe b tran1 V(3) #$T1$23: assemblycir run2.cir24: Vin 1 0 0V25: use SH126: .IC V(3) 1V27: runsim tran128: endassembly29: getprobe a1 tran1 V(3) #$T1$30: assemblycir run3.cir31: use SH232: .IC V(3) 1V33: runsim tran234: endassembly35: getprobe a2 tran2 V(3) #$T2$36: assemblycir run4.cir37: Vin 1 0 AC 138: Ec1 c1 x LAPLACE {V(c2)} {#$a1$*exp(-s*#$T1$)}39: Ex x 0 value={V(1)*#$b$}40: Ec2 c2 0 LAPLACE {V(c1)} {#$a2$*exp(-s*#$T2$)}41: runsim AC/nocsdf42: endassembly

PSiM Demonstrations

AC analysis of SH circuit

Frequency responses

Frequency

100Hz 10KHz10Hz 200KHz

DB(V(c1)) DB(V(c2))

-20

-10

0

Conclusions

•PSiM is an independent executable program which controls the OrCAD PSpice.

•It extends significantly the OrCAD PSpice features: Special simulation tasks can be performed which cannot be done by PSpice alone.

•Currently the PSiM working on the text file level is available.

•The graphical User's Interface (GUI) is developed.