By Topic

A Fully Integrated, Regulatorless CMOS Power Amplifier for Long-Range Wireless Sensor Communication

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

4 Author(s)
Bhagavatula, V. ; Department of Electrical Engineering, University of Washington, Seattle, ; Wesson, W.C. ; Shin, S.-K. ; Rudell, J.C.

This paper presents a CMOS power amplifier (PA) system designed with the explicit goal of customizing a high-output power transmitter for sensor applications, where the supply voltage from an energy storage element is often time varying. The PA is intended for use in a long-range sensor transceiver and can operate directly off a super-capacitor source. A constant output-power, regulatorless, series power-combined PA with a fully integrated tunable matching network is implemented in an attempt to eliminate all energy losses associated with a high-current voltage regulator. The PA monitors the output voltage at the off-chip antenna and digitally modulates the PA load impedance to maintain a constant target output power as the super-capacitor discharges. The PA system, integrated in a 90-nm CMOS process, has a peak output power of 24 dBm with an efficiency of 12% at 1.8 GHz, making it suitable for sensor data communication over distances of several hundred meters. As the PA supply varies from 2.5 to 1.5 V, the power control loop maintains a constant output power with an accuracy of \pm 0.8 dB.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:48 ,  Issue: 5 )