Class E Amplifiers - NorCal QRP
Reduce output when PA current gets too high! • Use resistor voltage drop to sense PA current (~0.175v @ 0.35A) • Amplify sense resistor voltage by 15x (~2.6v max) • Use amplified voltage (less 0.6v) to trigger over-voltage circuit • Trigger reduces PA gate bias & TX output power, limits PA current Monitor PA current Amplify PA Current ...
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