|
TOPSPICE SIMULATION – STEP BY
STEP TopSpice
from Penzar is a powerful and easy-to-use SPICE program (demo version) you
can download for free (See Demos and Downloads).
Here’s how to run a simulation for the SPICE file named LPFILTER1.CIR, plot
various results and modify the circuit.
DOWNLOADING THE CIRCUIT FILE.
1. From
the Circuit Collection page on this site, click on a circuit such
as RC Low-Pass Filter.
You’ll see a schematic along with circuit and simulation notes that you can
print out.
2.
Download the SPICE file LPFILTER1.CIR by clicking on download the SPICE
file on the web page.
RUNNING A SIMULATION.
1. Start
the TopSpice demo program.
2. To open
a SPICE circuit file select Open Saved SPICE (text) File. Move to
folder where you saved the SPICE circuit (LPFILTER.CIR), click on the
filename, then click on Open. The SPICE circuit file will appear in a
text editor window.
3. Select
Analysis > Run Simulation or click the simulation icon (traffic
light) along the top toolbar.
PLOTTING VOLTAGES
AND CURRENTS.
1.
TopSpice will automatically open a window to view your results. Select
Transient (time) or AC (frequency) to view the waveforms for
the simple low-pass filter.
2.
TopSpice automatically plots the waveforms specified by your PRINT
statements. For example, “.PRINT TRAN V(2)” plots the voltage at node 2
for transient (time) analysis.
3. You can
add additional waveforms by selecting Trace, Add. Finally, click
one of the voltages or currents in the variable list box and then click
Add.
NOTE
The PRINT statement also generates a numerical table of V(2) in a text
file with the “.out” extension. You can view this file by selecting
View > Output File from the menu. This output text file is available from
most SPICE simulators and can be viewed with a simple text editor like
Notepad. The PLOT statements creates a line-printer style plot in the text file using ascii
text characters.
MODIFYING YOUR
CIRCUIT.
1. In the
text editor’s window of TopSpice, modify component values or change
analysis commands in your SPICE circuit file.
2. Save
the file by selecting File > Save.
3. Now
you can run a new simulation by clicking on the simulation icon (traffic
light). It’s easy to change a component’s value and quickly see the effect
on your circuit.
Top ↑
PSPICE SIMULATION – STEP BY
STEP
PSPICE by
OrCAD is one of the most popular circuit simulators. You can download a free
demo version from the OrCAD (See Demos and
Downloads). Here’s how to run a
simulation for the SPICE file named LPFILTER1.CIR, plot various
results and modify the circuit.
DOWNLOADING THE CIRCUIT FILE.
1. From
the Circuit Collection page on this site, click on a circuit such
as RC Low-Pass Filter.
You’ll see a schematic along with circuit and simulation notes that you can
print out.
2.
Download the SPICE file LPFILTER1.CIR by clicking on download the SPICE
file on the web page.
RUNNING A SIMULATION.
1. Start
the PSPICE AD LITE demo program.
2. To open
a SPICE circuit file select Open > File. Drop down the Files
of Type box and select Circuit Files (*.cir) to make the *.cir
files visible. Move to
folder where you saved your SPICE circuit (LPFILTER.CIR), click on the
filename, then click on Open. Your SPICE circuit file will appear in a
text editor window.
3. Select
Simulation > Run or click the simulation icon (blue arrow) along the top toolbar.
PLOTTING VOLTAGES
AND CURRENTS.
1.
PSPICE will automatically open a window to view your results. Select
Transient (time) or AC (frequency) to view the waveforms for
the simple low-pass filter.
2.
To plot waveforms select Trace > Add Trace. In the Trace
expression: box type a voltage or current such as V(2) or
I(R1) and then OK. Or you can click on the available output
variables in the selection box and then OK.
NOTE
The PRINT statement also generates a numerical table of V(2) in a text
file with the “.out” extension. You can view this file by selecting
View > Output File from the menu. This output text file is available from
most SPICE simulators and can be viewed with a simple text editor like
Notepad. The PLOT statements creates a line-printer style plot in the text file using ascii
text characters.
MODIFYING YOUR
CIRCUIT.
1. In the
text editor’s window of PSPICE, modify component values or change
analysis commands in your SPICE circuit file.
2. Save
the file by selecting File > Save.
3. Now
you can run a new simulation by clicking on the simulation icon (blue arrow). It’s easy to change a component’s value and quickly see the effect
on your circuit.
Top ↑
SwitcherCAD III SIMULATION – STEP BY
STEP
SwitcherCAD
III from Linear Technology is the only free version with no component limit. You can download a free
demo version (See Demos and
Downloads). Here’s how to run a
simulation for the SPICE file named LPFILTER1.CIR, plot various
results and modify the circuit.
DOWNLOADING THE CIRCUIT FILE.
1. From
the Circuit Collection page on this site, click on a circuit such
as RC Low-Pass Filter.
You’ll see a schematic along with circuit and simulation notes that you can
print out.
2.
Download the SPICE file LPFILTER1.CIR by clicking on download the SPICE
file on the web page.
RUNNING A SIMULATION.
1. Start
the SwictherCAD III program.
2. To open
a SPICE circuit file select Open > File. Drop down the Files
of Type box and select Files of Type (*.cir) to make the *.cir
files visible. Move to
folder where you saved your SPICE circuit (LPFILTER.CIR), click on the
filename, then click on Open. Your SPICE circuit file will appear in a
text editor window.
3. Select
Simulate > Run or click the simulation icon (running man) on the top toolbar.
NOTE
You can specify an .AC or .TRAN Analysis in the netlist but not
both simulatenously. If both exist in your netlist, just place a "*"
before one of the statements to tell SPICE to ignore the line.
PLOTTING VOLTAGES
AND CURRENTS.
1.
SwitcherCAD III automatically opens a window for you to select which
waveforms to plot. The PRINT statement tells SPICE which waveforms to make
available. Excluding the PRINT statement makes all of the voltages and
currents available for selection.
2.
To add waveforms select Plot Settings > Add Traces. Click on one
or more of the voltages or currents available and then click OK.
MODIFYING YOUR
CIRCUIT.
1. In the
text editor’s window, modify component values or change
analysis commands in your SPICE circuit file.
2. Save
the file by selecting File > Save or can click
the simulation icon (running man) to save and run a new simulation.
Top ↑
|