#337

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:
http://soldersmoke.blogspot.com/

Wes's webpage: https://w7zoi.net/
The TIA paper: http://w7zoi.net/bidirectional_matche...
Papers on the theory and models of transistor amps:
http://w7zoi.net/fba_with_simple_mode...
http://w7zoi.net/transistor_models_an...