Driver stage of doherty power amplifier

[Mabrok]

Hi,
I will use PA driver stage in front of the full DPA to compensate for gain degradation. My question is, Should I consider the power consumption of the driver stage in the full DPA efficiency calculations and measurements? Thanks in advanced.

 

[vfone]

You have to take in consideration the driver power consumption from the moment that PAE (power added efficiency) is function of input power.

 

[Mabrok]

You have to take in consideration the driver power consumption from the moment that PAE (power added efficiency) is function of input power.

Thanks for your response. In my design i only consider the DE (drain efficiency) which is equal to Pout/Pdc(DC power cosumption). how to do with this?

 

[vivekroy]

You need to take into account the DC power consumption of the driver amplifier.

 

[Mabrok]

You need to take into account the DC power consumption of the driver amplifier.

That means I will lose the efficiency that i have achieved during DPA design as an additional power consumption will be added to that one from DPA. Any suggestion regarding this issue?

 

[vfone]

PAE equation stated that if you have less input power (using a driver) the efficiency is higher. So this should compensate somehow the DC power consumption of the driver.