Considering a design of a power amplifier, how should I choose a transistor which maximizes the 1dB compression point ? What parameters should be analyzed ?
Best regards,
Fabricio Simoes
Dear Fabricio,
welcome,
The one dB compression point is chosen to set a limit for the linear operating range of the amplifier.
So in order to extend this point at higher output power, one has to operate the transistor at higher power supply voltage.
One also nay increases the limit of the power by operating the transistor at higher currents. In class A configuration it is the quiescent current.
In class B it is the peak drain or the collector current.
So, it is the transistor ratings at the intended operating frequency which are interesting in increasing the one dB compression point.
Best wishes
Hi Fabrício Gerônimo Simões Silva ,
Multiple 'constraints' need consideration; examples like operating voltage current are already cited by Abdelhalim abdelnaby Zekry above. Assuming these are fixed, one may now shortlist 'suitable' RF power transistors and select the one with best 1dB level from the list. The transistors must be comparable for power, frequency, and mode of operation; if they operate at different voltage current levels, the constraints must be revisited along with match considerations.
A lot will get revealed as the design progresses!
Dear Abdelhalim abdelnaby Zekry , thanks for your response.
Best regards,
Dear Shiv Prasad Tripathy , thanks for your response,
Best regards
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