RF class AB power amp

my Guest 2014-09-24 14:32 #3815776

hello,
I would like to design a linear push pull class-AB 20W power amplifier 
in the HF band using similar RD16HHF Mitsubishi transistors. Here are 
the questions:
1- In this scenario, how much gain can I get from this push pull 
amplifier?
2- How I should calculate optimal values of the feedback network, to 
achieve maximum flatness over the entire bandwidth?
3- How can I estimate the input impedance of the power amp?
4- How much excess power (than  required) is needed at the output of the 
previous stage to maintain the linearity of the power amp.?
5- What's the reasonable values of the 2nd and 3rd harmonics (relative 
to the first harmonic)? In what percentage of the output power I should 
measure them?

any help or hint about the above mentioned problems would be 
appreciated,
regards
bye

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Benjamin Guest 2014-11-08 19:24 #3875417

Honestly,  I think you should start out a little easier. Try to find a 
construction of  an astable multivibrator, and work yourself up from 
there.
Eventually, you will be able to figure things out by yourself.

Happy building. :-)

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