I have some questions about the definition "base band".
I am now using the load pull simulation in ADS2011 by choosing the design from design guide.
In one tone and two tone source/load pull simulation, there are parameters "Z_Src_Baseband" or "Z_Load_Baseband" described as "Impedance at baseband frequencies"
What's the definition of baseband and baseband frequency?
How does this parameter effect the simulation result?
What value I should use?
In the load and source pull simulation setups, the impedances presented to the device are a function of frequency. In these setups, the "baseband" frequency is from 0 Hz to 0.5*fundamental frequency. If running 1-tone load pull simulations, the baseband impedances may not matter (but they could affect the bias voltages and currents if you don't have capacitors to block the DC.) For two-tone simulations, the baseband impedances will affect the device's performance, in some cases. You may want to experiment with different baseband impedances and see how your device's performance changes.
Any impedance matching network you design will have a baseband impedance, and these Z_Src_Baseband and Z_Load_Baseband values allow to set these impedances when running load pull.
The low-frequency impedances generated by the bias networks you use will also affect the device performance.