I have an LDMOS amplifier. I am testing it using a power meter. When the second port of the power meter is connected to standard 50 ohm termination, everything goes well.
However when I connect it to my load which shows 50 ohm on VNA, the Gate to Source Voltage increases and there is an abrupt increase in output power. I am unable find out the reason. Any help will be appreciated.
I have a power meter between the amplifier and the load. The output of the amplifier is connected to the first port of the power meter and the second port of the power meter is connected to the load.