2.6 Energy Parameters of Class A RF Power Amplifier
2.6.1 Drain Efficiency of Class A RF Power Amplifier
The operating point (the bias point) of the Class A RF power amplifier should be selected at the midpoint of the linear region of the transistor, where
The dc supply current of the Class A RF power amplifier is
The dc resistance seen by the power supply is
The dc supply power (or the dc input power) in the Class A RF power amplifier is given by
The dc supply power is constant and independent of the amplitude of the output voltage . The power delivered by the MOSFET to the output RF load at is given by
For , the drain power reaches its maximum ...