Requires: SmartSpice & Smartview

Minimum Versions: SmartSpice 4.30.5.R + SmartView 2.34.3.R

The SmartSpice application allows scripting of tasks in a control block of a SmartSpice input deck and to display results in the SmartView viewer. To illustrate this in a very simple case here is how to load in previously simulated dat in a RAW file and then to change contents before resaving the RAW file with the extra components. This is obviously very useful to avoid having to resimulate the circuit again and a real benefit in time saved especially when the simulation runs fore a long time. SmartSpice has the capability to load in a simulation data RAW file so further post processing on the results can be done without the need to re-simulate the circuit. This saves time when some extra waveform extraction is required from previous simulation runs.

To run the simulation:

• 1. Run the simulation input deck “ex2.in” in smartspice and exit. This will generate a raw file called “ex2.raw”.

• 2. Run simulation input deck “re_meas_raw.in”. This reads in the raw file “ex2.raw” and does some extra waveform analysis.

• 3. A new file is saved “ex2_plus.raw” with the extra data results.

This can be used as a template to do more elaborate post processing analysis and SmartSpice has the capability to do script type analysis. Details can be found in the SmartSpice User’s Manual Chapter 5

Input Files

ex2.in

TEST CIRCUIT - INPUT DECK
*
.SUBCKT  SUB1  1 2  3 
Q2  1 25 3  QNL
RS2  25 2  0.1K
.ENDS
.SUBCKT  SUB2  1 2 
Q3  1 2 VEE  QNL
Q4  2 2 VEE  QNL  1
.ENDS
.GLOBAL  VEE 
.OPTIONS RELTOL=0.01 ABSTOL=1N VNTOL=50U ITL1=100 ITL2=50 ITL4=10 ACCT NOMOD

*......... PART I. COMPONENTS and CIRCUITS ........................

VIN  1 0  DC -0.25  PULSE( -0.25 0.25 1N 2N 2N 18N 40N )  AC 1
VEE  VEE 0  DC -12
VCC  8 0  DC 12
X1  3 1 6  SUB1
CLOAD  3 4  0.75PF
RC1  3 8  RMOD  1K
RBIAS  7 8  2K
X2  4 0 6  SUB1 
X3  6 7  SUB2 
RC2  4 8  RMOD  1K
VGOAL3  VGOAL3 0  PWLDC( -0.25V 12 -0.2V 11.97 -0.15V 11.9 -0.1V 11 
+ -0.05V 9.2 0V 5.6 0.05V 2.1 0.1V 0.8  0.15V 0.4 2V 0.31 2.5V 0.3)
RGOAL3  VGOAL3 0  -1
.MODEL QNL NPN(BF=80 RB=100 CCS=0.2PF TF=0.03NS TR=0.6NS CJE=0.3PF CJC=0.2PF)
.MODEL RMOD R (TC1=0.003)

*........ PART II. ANALYSIS, OUTPUT and CONTROL CARDS .............

.TRAN  5NS 80NS 1NS 1.5NS  CALLV  SAVEV
.MEASURE  TRAN  MAX_TR_V3  MAX  V(3)
.MEASURE  TRAN  MIN_TR_V3  MIN  V(3)
.MEASURE  TRAN  FALL_1_TR_V3  WAVE   V(3) FALL=1 VAL0=MIN_TR_V3 VAL1=MAX_TR_V3
.MEASURE  TRAN  DEL_V3_V1     DELAY  V(1) RISE=1 VAL=0 TARG=V(3) FALL=1 VAL0=MIN_TR_V3 VAL1=MAX_TR_V3
.MEASURE  TRAN  CR_V3_V4_3    CROSS  V(3) V(4) OCCUR=3
.MODIF  RBIAS(RES)=2.5K  CLOAD(CAP)=0.75PF
+MODIF LOOP=5 STOP DEL_V3_V1 LE 2NS RBIAS(RES)*=0.9 CLOAD(CAP)*=0.6

.END

Reload_Simulation_data.in

Reload Simulation data for post processing
_____________________________________



   SmartSpice has the capability to load in a simulation data RAW file so further post processing on the results can be done without the need to re-simulate the circuit.
This saves time when some extra waveform extraction is required from previous simulation runs.


1. Run the simulation input deck “ex2.in” in smartspice and exit.
( or just use the attached simulation RAW file “ex2.raw” in step 2 )

2. Run simulation input deck “re_meas_raw.in”.
This reads in the raw file “ex2.raw” and does some extra waveform analysis

3. A new file is saved “ex2_plus.raw” with the extra data results


 This can be used as a template to do more elaborate post processing analysis and SmartSpice has the capability to do script type analysis.
Details can be found in the SmartSpice User’s Manual Chapter 5




                                                                                                                    Colins

re_meas_raw.in

* Simple script to measure on loaded raw file

.CONTROL

   Load ex2.raw

    measure max_v3 max tran1.v(3)
    measure max_v3 max tran2.v(3)
    measure max_v3 max tran3.v(3)

    measure max_v4 max tran1.v(4)
    measure max_v4 max tran2.v(4)
    measure max_v4 max tran3.v(4)

    setplot meas1

   Write ex2_plus.raw all

.endc