On Mon, Dec 5, 2022 at 08:48 AM, jinze peng wrote:
I try to use a 1:1 voltage balun as the input coupler of the small loop amplifier, so that the gain sweep can be performed directly through the NANOVNA, and I will connect a -10db attenuator in series with each of the two ports of the nanovna to prevent signal overload
Unfortunately this doesn't present the same source impedance to the amplifier as that of an actual loop.
You will obtain a fairly flat amplitude response, but this is just the amplifier and is not indicative of the actual system performance.
Regards,
Martin
