A noise receiver is included in a network analyzer block diagram such that noise power and S-parameters measurements can be made almost simultaneously without mechanical switching in the test set. Additionally, a variable mismatch device tuner that is used by the network analyzer for S-parameter calibrations, is further used during the noise figure measurements method to remove the effect of source match variations so that the expected noise figure performance of the DUT when connected to a desired input (probably 50 ohms) can be determined.
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