EXPERIMENT-1
AIM: Introduction
to Agilent ADS simulation software tool.
Introduction:
- Agilent Advanced Design System (ADS) is
an industry standard microwave engineering computer-aided-design (CAD)
program. Agilent ADS allows microwave engineers to analyze, design, and simulate
active and passive microwave components and systems.
- Advanced Design System uses projects to
organize and store the data generated when you create, simulate, and
analyze designs to accomplish your design goals. A project includes circuit,
layout, simulation, analysis, and output information on the designs that
you create, along with any links you add to other designs and projects. Use
the Main window or the Getting Started with ADS dialog, to create and open
projects. Both windows are displayed when you launch Advanced Design
System.
Circuit Simulation:
Here are some of ADS analysis:
- DC analysis: is used for
determining the bias point of the circuit.
- Transient analysis: runs
the time domain analysis on the circuits and considers the nonlinearity of
the elements.
- AC analysis: runs the
small signal analysis and use the linear model of elements on their bias
point. So the nonlinear elements like transistor are replaced by a linear
model (small signal circuit) which includes resistors, capacitors,
inductors and voltage & current sources.
- S parameters analysis: calculates
the Scattering parameters of the components, and shows the variation of
the S parameters over different frequencies. It is also used for
calculating noise figure and group delay.
Starting ADS:
- Advanced Design System uses projects to
organize and store the data generated when you create, simulate, and
analyze designs to accomplish your design goals.
- A project includes circuit, layout,
simulation, analysis, and output information on the designs that you
create, along with any links you add to other designs and projects.
- Use the Main window or the Getting
Started with ADS dialog, to create and open projects.
- Both windows are displayed when you
launch Advanced Design System.
Creating Projects:
Use the Main window
to create a project that you can then use to organize your designs. A project
includes circuit, layout, simulation, analysis, and output information on the
designs that you create, along with any links you add to other designs and
projects.
To create a project
1. Choose File > New Project
2. Enter Project Name & Location
Opening Projects:
Only one project can
be open at a time.
To open a project
chooses File > Open Project and use the dialog box to locate and open the
project.
Advanced Design
System offers an extensive set of example projects that demonstrate designing
for various technologies. You can view example projects, as well as copy and modify
them to create new projects.
Example Projects:
To view an example
project choose File > Example Project and use the Open Example Project
dialog box to select the directory and the project.
Design Circuit:
Advanced Design System uses designs to store the schematic and layout
information you generate to accomplish your design goals. A design can consist
of a single schematic or layout, or it can be made up of a number of schematics
and layouts embedded as sub networks within a single design. All designs in a project
can be displayed and opened directly from the Main window or from within a Design
window.
In a Design window
you can...
Create and modify
circuits and layouts
Add variables and
equations
Place and configure
components, shapes, and simulation controllers
Specify layer and
display preferences
Include annotations
using text and illustrations
Generate layouts
from schematics (and schematics from layouts)
The basic process of
creating a design or layout is as illustrated:
Creating Designs:
Choose Window > New
Schematic in the Main window and use the Schematic Wizard to set up a design.
Choose Insert > Template
in the Schematic window and select a template for the new file. When you use a
template, most of the initial setup and configuration for the schematic, the
simulation, and the data analysis is done for you automatically.
Choose File > New Design
in the Schematic (Layout) window and use the New Design dialog box to name the
file you are creating. You can also open the Schematic Wizard or choose a
Schematic Design Template from this dialog box.
Adding Components:
You can place,
connect, and configure the following items in the drawing area of your design
window to create your design:
- Components
- Data items
- Measurement sources
- Simulation controllers
You can also add entire circuits as sub networks to create hierarchical
designs. Keep in mind that when you begin a design using a template, most of
the simulation and analysis setup and configuration is done for you
automatically.
Simulating Designs:
Advanced Design System provides controllers that you can add and
configure to simulate, optimize, and test your designs.
A DSP design simulation requires a Data Flow Controller while an
Analog/RF design simulation requires one or more of various controllers. You
can either add or configure the appropriate controllers or you can insert a
template (choose Insert > Template from a Schematic window) that contains
the appropriate controllers.
To simulate a
design...
- Click and place controller:
- Double-click to edit parameters
3. Click to simulate
design
Creating Data
Displays:
The basic process of
creating a data display is as illustrated:
1. Choose a plot
type for the display
2. Choose the
dataset that contains the data you want to display
3. Select the data
variable to be displayed
4. Choose a trace
type for the display
To enhance the
display you can also add:
Markers to identify
specific data points
Annotations using
text and illustrations
Legends to help
identify specific traces
If you used a
template to create the design you have simulated, the initial setup and configuration
to create displays for data analysis is done for you automatically.
1. Click to open a
data display
2. Choose the
dataset that contains the data you want to display
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