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Sigrity – Tip of the week: How to define port impedance in PowerSI and Clarity 3D Layout

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To define a default port impedance value in PowerSI and Clarity 3D Layout, select Tools > Options > Edit Options > Network Parameters > Default Port Reference Impedance and define the impedance for Power nets and Signal nets.

It is important to define the correct values for Default Port Reference Impedance so that it matches the impedance value of Single-ended signal trace and Power trace impedance values. Otherwise, the simulation will see multiple unwanted reflections. The Power port impedance value can be reduced to meet the target impedance requirements. Similarly, the Signal port impedance is 50 ohms by default, but can be modified per the requirements/specs.

One can anytime modify the Port Impedance value of one particular port, if required. This can done by going to the Port setup window from menu Setup > Port and changing the Ref Z(Ohm) value against the respective port.

 

Any other parameters to take care of during the process of setting up ports?

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  • ShivaShankarM

    The port reference impedance is a critical parameter in S-parameter model extractions because it defines the impedance at which the S-parameters are referenced. It plays a crucial role in model extractions by ensuring consistency, compatibility, and accuracy in characterizing and simulating the behavior of multi-port networks. Properly defining the port reference impedance facilitates impedance matching, SI analysis, and the interoperability of RF components within complex systems.

    Further, you can refer the following article for more details.

    What are best practices for port reference impedance setup in Sigrity PowerSI

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  • ShivaShankarM

    The port reference impedance is a critical parameter in S-parameter model extractions because it defines the impedance at which the S-parameters are referenced. It plays a crucial role in model extractions by ensuring consistency, compatibility, and accuracy in characterizing and simulating the behavior of multi-port networks. Properly defining the port reference impedance facilitates impedance matching, SI analysis, and the interoperability of RF components within complex systems.

    Further, you can refer the following article for more details.

    What are best practices for port reference impedance setup in Sigrity PowerSI

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