SIwave: Assign Voltage/Current Ports Manually
When you run SIwave and you would like to perform DCIR analysis, you need to specify both a voltage source and a current source. The voltage source is the point where you know the voltage on your power plane, and the current source is where you know how much current your die is withdrawing when it's active.
SIwave typically assumes that these two ports are placed right where the discrete components or integrated circuits are located. However, if you want to place them in a random location, SIwave allows you to do so by manually assigning these ports in the circuit.
Steps to Assign Ports Manually
-
Identify the Voltage Source:
- Click on the voltage source icon.
- Place it anywhere you want, for example, between two points.
- Specify the magnitude and impedance. Typically, the impedance is very low due to parasitic resistance.
- Click "OK" to confirm. This is labeled as
V_1.
-
Place the Current Source:
- Click on the current source icon.
- Specify the location, for example, between two pads.
- Define the current withdrawal, such as one amp.
By following these steps, you can place your ports anywhere you want within the circuit.
Thank you.
"2mins SIwave: Assign Voltage/Current Ports Manually" When running SIwave, for DCIR analysis, specify a voltage source and a current source.
The voltage source is where you know the voltage on your power plane, and the current source is where you know how much your die is withdrawing current when active. SIwave assumes these ports are placed with discrete components or integrated circuits, but you can manually assign them in the circuit.
For example, you can place the voltage source between two points and specify its magnitude and impedance. To place a current source on a die, press the current source button, specify the location, and set the current value. This way, you can place ports anywhere needed.
