Channel: w2aew

Category: Science & Technology

Tags: nanovnasoldersmokes11s21rftektronixattenuatoramplifiertekw2aew

Description: This video shows how to measure the input impedance and gain of a small-signal RF amplifier - including the use of an attenuator to keep the amp in it's linear range and also to not overdrive the NanoVNA. This stems from a recent conversation with Bill N0CQR (SolderSmoke podcast). The amplifier featured is a "Termination Insensitive Amplifier" or TIA that is described in paper by Wes Hayward (W7ZOI) and Bob Kopski (K3NHI) - see links below: Soldersmoke blog: soldersmoke.blogspot.com Wes's webpage: w7zoi.net The TIA paper: w7zoi.net/bidirectional_matched_amplifier.pdf Papers on the theory and models of transistor amps: w7zoi.net/fba_with_simple_model.pdf w7zoi.net/transistor_models_and_the_fba.pdf