Paul678
Newbie level 6
It would appear most broadband amplifiers are conjugately matched on the input only, so that the S11's
inductive or capacitive reactances are cancelled out by the opposite reactances of the input matching network,
which is also called Z-source. This assured maximum power transfer into the transistor.
However, the output S22 is usually NOT conjugately matched to the Z-load, in a class C amplifier.
I have had at least one professional friend tell me that this means the S22 data from the S-parameter
files is pretty much worthless. I would therefore assume most of these output matching networks,
are created by the old "cut and try" empirical method, usually done on the actual, real bench.
So while we can usually simulate a good starting point for the input matching network,
in either ADS or Microwave Office ( or any other software package), it appears we cannot
do the same for the output matching network.
So how do you all find a good starting point for the output matching network, in a Class C, broadband
amplifier?
inductive or capacitive reactances are cancelled out by the opposite reactances of the input matching network,
which is also called Z-source. This assured maximum power transfer into the transistor.
However, the output S22 is usually NOT conjugately matched to the Z-load, in a class C amplifier.
I have had at least one professional friend tell me that this means the S22 data from the S-parameter
files is pretty much worthless. I would therefore assume most of these output matching networks,
are created by the old "cut and try" empirical method, usually done on the actual, real bench.
So while we can usually simulate a good starting point for the input matching network,
in either ADS or Microwave Office ( or any other software package), it appears we cannot
do the same for the output matching network.
So how do you all find a good starting point for the output matching network, in a Class C, broadband
amplifier?