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Measurement of Losses in Noise-Matching Networks
By: Strid, E.W.;
1981 / IEEE
This item was taken from the IEEE Periodical ' Measurement of Losses in Noise-Matching Networks ' The noise contribution of an input-matching network to a low-noise amplifier is equal to the inverse of the network's available gain. The available gain of various networks at 4 GHz was computed from high-accuracy S-parameter measurements. The available gain of a typical tuner was experimentally found to be a strong function of its tuning, which shows that ""back-to-back"" measurements of two tuners to obtain the loss of each tuner can be inaccurate. Measurement of the available gain of an amplifier's input-matching circuit is shown to give quick insight into its minimum noise contribution before the actual amplifier stage is built.