The announcement this week by Sequoia Communications of a single-chip HEDGE transceiver based on polar modulation calls out for an explanation of what polar modulation is all about and how it varies. Find out more in this special feature compilation.
Sequoia's transceiver supports HSDPA/EDGE
The case for polar modulation and its variants:
Polar modulation ups efficiency in mobile PA designs
Frank Ditore of Agilent EEsof EDA explains why polar modulation is necessary, what it actually does and of course, how it's done.
Direct polar modulation has the right stuff
Tropian's Earl McCune explains the differences between small signal/polar lite, polar loop and direct (open-loop) polarand why the latter is the only way to go.
Polarizing RF transmitters for multimode operation
Mark Heimbach of Tropian gives a dissertation on the basics of polar modulation and what it's all about.
Compare the transmitter architectures for EDGE/GSM handsets
Mike Durrant, Bob Broughton, and Chris Beale of Analog Devices Inc. divide polar modulation into four groups: polar feedback "Lite", polar feedback, polar open loop and direct modulation (homodyne). For them, direct modulation looks appealing, but has serious issues. Instead, the polar feedback technique is the way to go.