1. LNA Simulation Tutorial
EE395
Lily Chan
Spring 2012
March 22, 2012

2. Step 1 Open Analog Environment Setup models Setup > model libraries
Add paths to models

3. Step 2 Go to Analyses tab Choose dc analysis
Click the box to save DC Operating Point

4. Step 3 Add variables from schematic Variables > Copy from Cellview
Input variable values

5. 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)

6. 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

7. Step 5 Result
A window with the Smith chart should pop up showing you the S11 and S22 curves

8. Step 6 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

9. Step 7
On the direct plot form, click on S21
This is your gain

10. Step 8 On the direct plot form, choose Function = NF Modifier = db10
Click on Plot
This is your noise figure