Feedforward Amplifier design

Thread Starter

BRUNET Joss

Joined Nov 1, 2018
24
Hello,

I'm looking to design an Feedforward amplifier to handle multi carriers at high output power level at 100 and 400 MHz.
Here is a link to an example : http://literature.cdn.keysight.com/litweb/pdf/genesys200801/examples/spectrasys/amplifier_1.htm

FeefForward.PNG

My stronger constraint is the delay line TL1 and TL2 (as shown above) which is too long at 100 MHz and even at 400 MHz.

filtre_passe_bas.PNG

I thought to use high power custom low pass filter as show above, in cascade to achieve the necessary delay. Is it possible ? What do you think about that ?

Regards,
Joss
 

Thread Starter

BRUNET Joss

Joined Nov 1, 2018
24
I spoke with an RF expert, he told me that Bessel filter is the right choice to made group delay constant and that more globally, that is the right solution.
However, with this kind of filter, the handle power is only about 10W, take care about it. But in my case, it is ok.
 
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