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[SOLVED] Designing wide-band RF power Amplifier

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Mabrok

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Hi

In designing of wide-band RF power amplifier, if the input and output return loss (S11 & S22) are -5dB over the whole bandwidth ( 2GHz to 4GHz). Is it acceptable? and how much will affect the output power?and what is the ideal value of input and output return loss of designing wide-band power amplifier?

Thank you S11 S22.png
 

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    Mabrok

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-5dB for especially S11 is low, ti should be at least -10dB.
S22 can be around because load will probably different than 50 Ohm, so complex conjugate matching is not expected.
 
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    Mabrok

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BigBoss said:
-5dB for especially S11 is low, ti should be at least -10dB.
S22 can be around because load will probably different than 50 Ohm, so complex conjugate matching is not expected.
Click to expand...

Thank you for the information
So, how to reduces S11 to be around -10dB?
 

Mabrok said:
Thank you for the information
So, how to reduces S11 to be around -10dB?
Click to expand...
Wideband matching is really difficult.There are few approximation about it and series connected Low Pass/High Pass forms or PI or T forms are frequently used.So, every section maintains a degree of matching at adjacent frequencies/bands and at the final the whole circuit brings the desired matching over a band.But this technique is pretty lossy and space consuming.
Real Frequency Technique is another option but it needs a bit computer support.I heard there are some Matlab routines but I don't know how they work.
 
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    Mabrok

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Hi

Anyone know how to simulate PAE of PA using ADS ?
 

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