Title :
A Mixed-Signal Matching State Search Based Adaptive Antenna Tuning IC
Author :
Song, Hang ; Aberle, James T. ; Bakkaloglu, Bertan
Author_Institution :
Sch. of Electr., Comput. & Energy Eng., Arizona State Univ., Tempe, AZ, USA
Abstract :
A closed-loop adaptive antenna tuning unit operating from 850 MHz-2 GHz for multi-band, multi-mode radios is presented. Unlike previous approaches, the proposed module utilizes an analog mismatch detector and a closed-loop mixed-signal matching state search circuit, without the need for an A/D converter. The integrated module is designed and fabricated on a 0.18 CMOS process. When tested on a band-limited shorted patch antenna, the module can perform a scan of 4096 antenna matching states in 4.1 ms, and tune the antenna to a specified narrow instantaneous bandwidth over the entire frequency range.
Keywords :
CMOS integrated circuits; UHF antennas; microstrip antennas; multifrequency antennas; tuning; CMOS process; UHF antennas; adaptive antenna tuning integrated circuit; antenna matching states; closed-loop mixed-signal matching state search circuit; frequency 850 MHz to 2 GHz; multi-band radios; patch antenna; size 0.18 mum; Antennas; Detectors; Impedance; Integrated circuits; Radio frequency; Switches; Tuning; Analog processing; antenna tuning unit; impedance matching; reconfigurable matching networks;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2010.2061222
