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Auxiliary (peaking) stage of doherty power amplifier

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Mabrok

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Hi,

When the auxiliary (peaking) stage of DPA should turn on exactly (with respect to the main DPA)? Is it at Psat of main DPA or before it saturates? Thanks in advanced
 

Depends on the bias point.
It should be arranged so that the efficiency start to drop down, auxiliary amplifier should start to deliver RF power to maintain the efficiency stable.
 

    M

    Mabrok

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BigBoss said:
Depends on the bias point.
It should be arranged so that the efficiency start to drop down, auxiliary amplifier should start to deliver RF power to maintain the efficiency stable.
Click to expand...
How we can relate that to the power of the main branch? As I can see in my design the main branch can maintain high efficiency(Drain efficiency) for high power levels (up to 40 dBm input power).
 

Mabrok said:
How we can relate that to the power of the main branch? As I can see in my design the main branch can maintain high efficiency(Drain efficiency) for high power levels (up to 40 dBm input power).
Click to expand...
Not Input Power.. Remember an Efficiency of an Power Amplifier vs Output Power.
Drain Efficiency is not taken into account. Power Added Efficiency is more important.
It raises at the beginning then enters a relatively flat region then drops down slightly..
"You" will choose where the auxiliary amplifier delivers/adds additional power.
 

    M

    Mabrok

    Points: 2
    Helpful Answer Positive Rating
BigBoss said:
Not Input Power.. Remember an Efficiency of an Power Amplifier vs Output Power.
Drain Efficiency is not taken into account. Power Added Efficiency is more important.
It raises at the beginning then enters a relatively flat region then drops down slightly..
"You" will choose where the auxiliary amplifier delivers/adds additional power.
Click to expand...
Early turn on of auxiliary amplifier does it have any bad effect on the circuit? (during the power measurements as i can see no problem with the simulation using ADS
 

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