Transcript S-parameter simulation steps from Y. Lin

S-parameters measurements
If you use Spectre
1.
In the schematic view, add instance “psin” from analoglib/sources/ports
2.
Each port of the DUT is connected to one “psin”
3.
In the property form of “psin”, specify the resistance (like 50ohm) and port number.
For each “psin”, the port number should be different (such as “1”, “2”). (As shown in
Fig.2)
4.
Open analog artist window (As shown in Fig.3)
5.
Click “Analyses” and then click “sp” (“sp” stands for “S-parameter"), fill out the form
like what is shown in Fig.4. Make sure you push the “select” button in “S-parameter
analysis” session and then choose the right ports in your schematic. Make sure the
port names show up in the window. Then click “ok”.
6.
Run simulation
7.
After you finish simulation, choose result/direct plot/main form, the pop-up window is
shown in Fig.5
8.
In the form, select “sp” in the “function" session and select the plot type and modifier
that you want. Then you can plot Sij by clicking the corresponding button.
9.
If you are interested in the NF, you can click “NF” in the “function” session and plot
NF. However, this number is not accurate
10. If you want to measure the S-parameters of three-port DUT like mixer. You can
ground one input and measure the S-parameters. Repeat for the other input port.
You have two sets of S-parameter.
If you use Spice
11. Set up the circuit based on the definition, measure current and voltage to calculate
the S-parameters.
PORT0
r:50
psin
PORT1
DUT
r:50
psin
Fig.1. S-parameter measurement of DUT
Fig.2. The property form of instance “psin”
Fig.3. Analog Artist window
Fig.4. “sp” analysis form
Fig.5. Direct plot form