Transcript Cadence Presentation

Getting Started with Cadence
Prepared by Ryan Johnson, 2002
Open Orcad Capture under Engineering
Software
Under FILE, choose NEW, PROJECT
The following box should appear…
To Simulate a design, choose Analog
or Mixed A/D.
Choose where you will save it and
what you will call it.
Click OK
In the next box, choose if you want to
create a blank project or
one based on an existing project.
Click OK.
A blank schematic page will appear.
This is where you will draw your schematic.
Important: Notice that there is a PSpice menu on the menu bar. If this is not there, you
will not be able to simulate your circuit.
Also notice that there are a few more options compared to PSpice 8.
Voltage differential markers
Power dissipation of a device
Bias point quiescent power
 When you create a new project, a box window
will appear that shows the design
hierarchy. This is where you can
access all the files associated with
your project.
It keeps a list of such things as:
Schematics
Parts used
Simulation profiles
Libraries used
Etc…
Circuit Creation
To place a part, in Place menu,
choose Part.
The following box will appear…
You have to add the specific
libraries to your project of the
parts you will use.
Choose Add Library
The libraries that contain parts that will
allow you to simulate are found in
folders labeled PSpice.
These parts have a PSpice model
attributes with them that can be
changed.
Choose the libraries that you want to add,
and select the parts that you want to
use.
Your project profile
will keep a
record of each type
of part you use in a
place called
Design Cache.
While you place your parts, use the wire button to place wires.
It is found on the right-hand side toolbar. Make sure
that you have good connections.
Cadence is really picky about which GND you use when simulating
circuit. To get this GND, choose the GND button.
The following box should appear where you can add a
library that contains the proper GND. The library should
once again come from the PSpice folder as these parts have
simulation attributes
with them. The best
way to know that you
have the right one is by
checking if it has a
zero next to it.
a
If you need to change the parameters of the component, click on the component so that it is
highlighted. Under the Edit menu, choose PSpice Model. The following widow
should appear.
Change the parameters
that need to be
changed, and then save
it. This will force the
same parameters
for this type of
component in
this project. Next
time that you use this
piece in this project,
it will have the same
parameters.
Sample Circuit
(Note that parameters of each component is set the same way as in
PSpice 8, by double clicking on it)
There are a couple of different ways to check for errors in your circuit. The first is by creating
a netlist.
Under the PSpice menu, choose Create Netlist.
You can view the netlist by choosing View Netlist, under the same PSpice menu.
The next way is to actually simulate the circuit.
To simulate, you need to create a new simulation profile. Under the PSpice menu,
choose New Simulation Profile. The following window will appear so that you can
name it. You can also choose which schematic you want it to associate with.
Once you have named it, click OK, and the following simulation settings widow will pop up.
This is where you choose what you want to do when you simulate.
In this menu, you can choose
what type if simulation to
do (Transient, DC Sweep,
AC Sweep, or Bias Pt)
These are options for each
type of simulation.
If you want to restore your
last simulation data
points, you would click
to this menu.
Once you have everything figured to how you want it, click OK. To simulate, you need
to push the play button.