Title :
An RF–DC Converter with Wide-Dynamic-Range Input Matching for Power Recovery Applications
Author :
Abdelhalem, Sherif H. ; Gudem, Prasad S. ; Larson, Lawrence E.
Author_Institution :
Univ. of California, San Diego, La Jolla, CA, USA
Abstract :
An improved RF-dc converter based on a class-E rectifier with wide-dynamic-range input matching is presented. The input impedance is controlled by two varactor diodes to compensate for impedance changes with RF input power and dc loading conditions. The RF-dc converter achieved a peak efficiency of 60% and an S11 less than - 20 dB over an input RF power range of 12 dB and an operating battery voltage of 2.5-4.2 V at 800 MHz. An analytical model for input impedance and efficiency was developed and shown to match simulation and measurement results.
Keywords :
UHF diodes; convertors; rectifiers; varactors; class-E rectifier; efficiency 60 percent; frequency 800 MHz; improved RF-DC converter; power recovery applications; varactor diodes; voltage 2.5 V to 4.2 V; wide-dynamic-range input matching; Class-E rectifier; RF–dc converter; hybrid transformer duplexer; impedance matching; power recycling;
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
DOI :
10.1109/TCSII.2013.2258261
