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NF calibration: Power sensor vs Noise Source

Question asked by YP on Apr 4, 2017
Latest reply on Apr 12, 2017 by david_ballo

Hi, I am trying to measure the NF of a LNA MMIC die. LNA Gain: 15-20dB, NF about 1dB. Input power:-20dBm.


For this measurement using Vector Noise cal: I measure it with a Noise source as well as a Power sensor and obtained different results.  Results are attached in Results.jpg


For the Noise Source Setup and Power sensor setup: Please refer  NS setup.jpg and PS Setup.jpg


Q1: I am following the steps in the cal wizard, I am not sure what is meant by “Embed this section to move noise-cal reference plant to the 2 port-cal reference plane.”?


Q2: Why is there a difference?