LNA Simulation
Tutorial
EE395
Lily Chan
Spring 2012
March 22, 2012
Step 1


Open Analog
Environment
Setup models

Setup > model libraries
 Add paths to models
Step 2
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Go to Analyses tab


Choose dc analysis
Click the box to save DC
Operating Point
Step 3

Add variables from
schematic


Variables > Copy from
Cellview
Input variable values
Step 4

Choose Analyses







Select sp in the Analysis section
Click select in the Ports section
 Click on the input and output
ports on the schematic
Select Frequency in the Sweep
Variable section
Enter the start/stop sweep range
Select Do Noise = yes
 Enter your Input and output ports
Click on OK
Click on Netlist and Run (The traffic
light button with the green light in the
Analog Environment main screen)
Step 5



After the simulation is
done running, click on
Results > direct plot >
main form
Choose SP > plot type
= Z-smith
Then click on S11 and
S22 buttons
Step 5 Result

A window with the
Smith chart should pop
up showing you the
S11 and S22 curves
Step 6



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Go back to the Direct plot form from step
5
Select plot type Rectangular, Modifier =
dB20
Click s11, s22
These are your input/output impedance
matching curves
Step 7


On the direct plot form,
click on S21
This is your gain
Step 8

On the direct plot form, choose

Function = NF

Modifier = db10

Click on Plot

This is your noise figure