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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...
An adaptive antenna-tuning units (AATU) utilizing analog mismatch detection and mixed-signal matching-state search circuits operating in a frequency band from 850 MHz to 2 GHz is presented. The fully integrated AATU IC is fabricated in a 0.18 mum 6-layer metal CMOS process.
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