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Unformatted text preview: 1 ELEC5403 LAB 4 S-PARAMETER MEASUREMENT TECHNIQUE The vector voltmeter measures the magnitude of a reference and test voltage and the difference in phase between the voltages. Because it can measure phase, it allows us to directly measure the S-parameters of a circuit. Unfortunately, the use of directional couplers and test cables connecting the measuring system to the vector voltmeter introduces unknown attenuation and phase shift into the me asurements. These c an be compensated for by ma king a dditional " calibration" measurements. Refer to Users Guide for calibration and measurement proceedures. NOTE . Use a 10dB pad as the DUT throughout the Lab. A) Reflection measurements: obtain S 11 or S 22 Set up the experimental arrangement shown in Figure 1 . I t is seen that the voltage a t channel A of the vector voltmeter ( 29 D A is proportional to the amplitude of the voltage wave entering the device under test (DUT) ( 29 D 1 a . Similarly, the voltage a t c hannel B ( 29 D B is proportional to the amplitude of the voltage wave reflected from the DUT...
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This note was uploaded on 04/25/2010 for the course ELEC 5403 taught by Professor Kumar during the Spring '10 term at Birla Institute of Technology & Science.
- Spring '10