Small-signal S21 measurements. Pin=-20dBm

Comments:

• I'm plotting 50MHz to 1GHz. The top end of that spectrum is outside the amps specification, just plotted for interest
• gain flatness looks good (as before) on all channels apart from channel 4, where the matching seems to be off
• gain is too high for basically all channels (we agreed to aim for 40dB at the center of the gain profile IIRC). I assume that this is due to the replacement of FETs, without retuning the gain. That's fine for this prototype unit, but obviously wouldn't be okay for a production unit