I have a radio signal source (USRP N210 with a WBX daughterboard) that can supply a maximum power of 100mW. I am designing a power amplifier for it and I would like to simulate the radio signal source in Spice. What is the equivalent circuit ( maybe the Thevenin equivalent) of the radio signal source (USRP N210) so that I can simulate it in Spice?
I know that for maximum power transfer, the internal resistance of the signal source must be 50 ohms (typical resistance of an antenna). Does that mean to supply a 100mW sine wave, the signal source behaves like an ac voltage source with a peak voltage of 6.3V with a series resistance of 50 ohms so that the power across a 50ohm load would be 100mW?