Journal
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
Volume 65, Issue 5, Pages 1731-1743Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCSI.2017.2765325
Keywords
RF front-end; antenna tuning; impedance detector; cellular; adaptive antenna tuning; LTE; closed-loop tuning; coupler; RF switch; successive approximation; reflectometer
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A radio-frequency (RF) scalar reflectometer detecting a load return loss value by successively attenuating the forward-coupled RF power until it reaches the level of reverse-coupled RF power is presented in this paper. The device operates at cellular frequencies between 690 and 2700 MHz and covers voltage standing wave ratios range up to 20: 1. The monolithically integrated device comprising an RF core, an analog-to-digital converter, a power regulation unit, and a serial communication interface occupies a die area of 850x850 mu m(2) in 130-nm CMOS technology and consumes a maximum supply current of 400 mu A from a 2.8 V supply during detection. The device does not require frequency and temperature calibration when operating in scalar mode. A method for operating the same integrated circuit (IC) in vector detection mode is briefly introduced. The target application for the presented reflectometer IC is impedance sensing in antenna tuning RF front-ends.
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