Elinor Knaani-Kashani 27/12/15

You are invited to attend a lecture

By

Elinor Knaani-Kashani

Ms.c. student of Doctor Eran Socher

Electrical Engineering, Physical Electronics Department

Tel Aviv University

Digital Closed Loop Design for Wideband Envelope Tracking Systems

Abstract

Power supply control schemes such as envelope tracking (ET) offer the greatest potential of high average efficiency operation for high peak-to-average power ratio (PAPR) signals. Envelope tracking systems are becoming a great opportunity since high PAPR systems are becoming very common (e.g. wifi, wimax, LTE, etc.), and power saving is needed. Naturally, in time, the need for throughput is increased, which implicates on the signal bandwidth, and traditional tracking systems become less efficient.

In this talk, we describe two topologies of digital closed loop envelope tracking systems for high bandwidth communication systems: A fast switching digital DC2DC based ET and a Multilevel ET based on multiple high BW digital low dropout (DLDO) voltage regulators. In both solutions, we introduce fast digital controllers, as well as digital mechanisms to overcome noise and voltage level transitions, which were not seen before in analog ET systems.

Both topologies were tested on a high-level simulation platform, examining the challenges each one presents, and showing the mechanisms to overcome them. We will show that although the existing highly non-linear PA in our system, both architectures provide the solution in terms of mask limitation, and error vector magnitude (EVM).

Sunday, 27 December 2015, at 12:30

Room 101, Software Building