Design of a Power Amplifier and Envelope Amplifier for a Multi-band Multi-standard Envelope Tracking System

[摘要] This thesis presents the design of a Power Amplifier (PA) and envelope amplifier for an EnvelopeTracking (ET) system that is aimed at meeting emerging radio standards in terms of power efficiencyand linearity. The class J mode of operation, as well as the efficiency and power contours from loadpull was exploited to develop an adequate procedure for the design of a broadband and highefficiency radio frequency PA. An in-depth study has also been conducted for a hybrid envelopeamplifier topology in order to optimize it for power efficiency through proper setting of its switchingstage supply. Two separate proof of concept prototypes of the PA and envelop amplifier weredesigned, fabricated and tested. The PA designed was able to achieve an average drain efficiency of73.6%, average output power of 45.89dBm, and an average gain of 18dB between 650MHz and1.050GHz (48% bandwidth). The envelope amplifier achieved close to 74.6% efficiency for a 5MHzbandwidth LTE signal envelope with 6.4dB peak to average power ratio.

[发布机构] University of Waterloo

[关键词] Electrical and Computer Engineering