Continuous Classes of Power Amplifiers

In wireless systems a trend towards integration of all building blocks of trans- mitter and receiver into mainstream CMOS is going on. The Power Ampli¯er is one of the most di±cult blocks to integrate; a relative high power block to in- tegrate in a process with relative low quality factors and nonlinear components. In this report an RF model is presented that can be used for designing a PA using nonlinear components. With this developed model calculations are done that show that it is possible to in°uence the output phase by varying the input signal and by varying the X reactance. It is also shown that there is a trade o® between the input signal amplitude and the PA e±ciency. Simulations with varying input signal and varying X reactance show that it is possible to control both the output power and output phase of a Class-E PA.