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A 2-GHz GaAs HBT RF Pulsewidth Modulator300

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 56, NO. 2, FEBRUARY 2008

A 2-GHz GaAs HBT RF Pulsewidth Modulator
Michael Nielsen and Torben Larsen, Senior Member, IEEE
Abstract―RF pulsewidth modulation (PWM) has been proposed as an efciency improving technique for power ampliers (PAs) handling varying envelope signals. The core idea is to modulate the varying envelope into a square-wave signal such that the width of each pulse is varied according to the envelope, and any phase information is contained in the timing of the pulses. The square wave signal can give a theoretical efciency of 100% for the subsequent PA. Such a system differs signicantly from a conventional up-conversion and PA and, therefore, a signicant design challenge results. The rst important step is to ge