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Radio-Frequency Digital-to-Analog Converters:Implementation in Nanoscale CMOS
Radio-Frequency Digital-to-Analog Converters:Implementation in Nanoscale CMOS.rar
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The work on this RFDAC idea can be traced all the way back to 2001 when our small group at Texas Instruments (TI) was busy inventing new digital methods of realizing the traditional analog-intensive RF transceiver functions. The design of our first digital RF processor (DRP) for Bluetooth in 130 nm CMOS was coming to an end but we still needed to obtain some form of RF power regulation so that the transmitter (TX) would not produce too little or too much RF power. Hence, we added a few other transistors parallel to the main transistor of the switchedmode (thus, digital!) power amplifier operating in class-E mode (theoretically, up to 100% efficient!). Little did we know that those extra transistors would become extremely handy when another group from TI-Israel asked us to add amplitude modulation (AM) to the original frequency-modulated (FM) Bluetooth signal for the new extended data rate mode. The fully digital vector modulation (AM combined with FM) could not be made any much simpler: We just expanded the number of transistors from 8 to 256 to get the sufficient AM resolution in addition to the fine frequency resolution from an all-digital phase-locked loop (ADPLL), which was invented a couple of years earlier in the same DRP group as part of my part-time PhD research. |
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