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Calculating Transmission Line Input Impedance

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‎07-30-2010 04:10 PM
Last Edited by: Jim_S ‎01-30-2017 09:45 AM

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Introduction

InputImpedance.png

Diagram of the Measurement/Generation System

When generating or acquiring at higher frequencies, it become extremely important to calculate the impedance that is seen by the instrument. This VI calcuates the input impedance at the card when the load (sensor, DUT, etc) is an known impedance. In this particular VI, it makes certain assumptions that are: the transmission line is lossless and the impedance of the load is constant over the entire frequency spectrum. Knowing this, it uses this following equation:

Equationinputimpedance.png

Input Impedance Equation


Jim St
National Instruments
RF Product Support Engineer

Example code from the Example Code Exchange in the NI Community is licensed with the MIT license.

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