“…The average PAE for class AB PA with high PAR signals, therefore, is quite poor and this is a major barrier for battery size reduction. It is possible, however, to achieve a significant improvement in wideband PAE using monolithic switch-mode PA by using envelope tracking (ET) [17][18]. For base station applications, this ET technique has proven to offer considerable reduction in heat dissipation for 3G, WiMAX and DVB transmitters [24,[34][35] Specifically, in ET-based large-signal polar transmitter, the voltage supplied to the final stage of the RF PA is changed dynamically, synchronized with the RF signal passing through the device to ensure that the PA remains saturated and efficient.…”