Cadence Presentation

8/6/2019 Cadence Presentation

1/17

Getting Started with Cadence

Compiled by Ryan JohnsonApril 24, 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

willc

all it.

ClickOK


2/17

In the next box, choose if you want to

create a blankproject or

one based on an existing project.

ClickOK.

A blank schematic page will appear.

This is where you will draw your schematic.

Important:

N

otic

e that there is a PSpic

e menu

on the menu

bar.I

f this is not there, you

will not be able to simulate your circuit.


3/17

When youcreate a new project, a windowwill appear that shows the design

hierarchy. This is where youcan

access all the files associated with

your project.

It keeps a list of things such as:

Schematics

Parts used

Simulation profiles

Libraries used

Etc

To get to this window from your schematic,

choose the Windowtoolbar and then

choose the name of the project you

want to view (*.opj)


4/17

Getting Familiar with the Toolbars

The top of the schematic page will have the following toolbar:

Zoom buttons are here:

The parts that youuse will be listed here for easy access:

These buttons are used for measurements on your schematic during simulations:

These buttons are used for creating a new simulation profile, changing the profile

characteristics, and running your simulation:


5/17

This toolbar gives shortcuts for building the circuit.

Place a part button:

Draw a wire button:

Place power node button:

Place GND button:


6/17

To place a part on your schematic,

in Place menu,

choose Part.

The following box will appearYou have to add the specific

libraries to your project of the

parts you will use.

ChooseAdd Library

Circuit Creation


7/17

The libraries that contain parts that will

allow you

to simu

late are fou

nd infolders labeled PSpice.

These parts have PSpice model

attributes with them.

Choose the libraries that you want to add.

Sometimes it is hard to know what

library parts are in. If youknow

the name of the part that you want,

youcan also search for the part.


8/17

The parts found in the library are

listed here:

Select the part that you want to

place.

Your project profile

will keep a

record of each type

of part youuse in a

place called

Design Cache.


9/17

To change the values of the parts, double clickon the part. The

following page should appear:

To view only the Spice (or simulation) properties of the components,

change this box to Orcad-PSpice. Once done, the page will only show

the parameters that affect simulations. Change the value of the

component, clickApply,and exit the page.


10/17

While you place your parts, use the wire button to place wires.

I

t is fou

nd on the right-hand side toolbar. Mak

e su

rethat you have good connections.

Cadence is really picky about which GNDyouuse when simulating a

circuit. To get this GND,choose the GNDbutton.

The following box should appear where youcan add a

library that contains the proper GND. The library shouldonce 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 bychecking if it has a

zero next to it.


11/17

If you need to change the internal parameters of the component, clickon 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 youuse this

piece in this project,

it will have these

changed parameters.


12/17

There are a couple of different ways to checkfor errors in your circuit. The first is bycreating

a netlist.

Under the PSpice menu, choose Create Netlist.

Youcan view the netlist bychoosingView 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 youcanname it. Youcan also choose which schematic you want it to associate with.


13/17

Once you have named it, clickOK, and the following simulation settings widow will pop up.

This is where youchoose what you want to do when you simulate.

In this menu, youcan choose

what type if simulation to

do (Transient, DC Sweep,

AC Sweep, or Bias Pt)

There are options for each

type of simulation.

If you want to restore your

last simulation data

points, you would click

to this menu. The last

simulation will not be

overwritten.

Once you have everything figured to how you want it, clickOK. To simulate, you need

to push the play button.


14/17

Once you push Run, the following widow will appear as Spice checks for errors and

completes the simulation.


15/17

Then, the simulation results will appear.

If you have measurement markers placed on the circuit, the waveforms will appear. If not,

then you need to tell Spice which results to display.

To do this, in Spice chooseTrace,Add Trace. The following window will appear. Choose

the results you would

like to view.


16/17

Sample Circuit

(with Sample Simulation)

out1

V2

12V

out2

Q4Q2N2222

V

V1

V3

-12V

VEE

0

C1

5p

RBIAS20k

V

RS2

1k

Q2Q2N2222

VDD

0

Q3Q2N2222

RC210k

VEE

Q1Q2N2222

RC110k

0

VDD

RS1

1k


17/17

Cadence Presentation

Documents