BUCK-BOOST POWER AMPLIFIER WITH INDEPENDENTLY CONTROLLED POWER STAGES AND COMPENSATED NONLINEAR PULSE WIDTH MODULATOR

摘要

A buck-boost power amplifier receiving a supply voltage and providing an output having a voltage swing higher than the supply voltage is provided. The buck-boost power amplifier comprises a buck power stage, a boost power stage, an inductor, and a non-linear pulse width modulator. The buck power stage and the boost power stage are independently controlled by the non-linear pulse width modulator. The non-linear pulse width modulator switches the buck-boost power amplifier between a buck mode wherein the output provides a voltage lower than the supply voltage and a boost mode wherein the output provides a voltage higher than the supply voltage.