the major power loss in power amplifiers is usually due to power dissipated in the transistor(s). This was true for the Class A, B, and C PAs (their theoretical collector efficiency was calculated in ...

For example, a 900-MHz cascode power amplifier based on a 0.25-/xm CMOS technology with active die area of 2 x 2 mm 2 can provide an output power of 0.9 W and a power-added efficiency of 41% using a ...