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An IEEE 802.11ah-compliant RF transceiver with a direct-conversion receiver and a fully-digital polar transmitter is presented. For the receiver, a current-mode RF front-end covers the mandatory modes worldwide from 755MHz to 928MHz. The digitally-assisted analog baseband achieves variable gains and bandwidths with an automatic gain/DC-offset calibration. Implemented in 40nm CMOS with 1V supply, this...
A 1.3 nJ/b IEEE 802.11ah TX for IoT applications is presented. A fully-digital polar architecture consisting of an all-digital PLL-based frequency modulator and an AM-retiming $\Delta \Sigma $ switched-capacitor PA (SC-PA) achieves more than $10\times $ power reduction than state-of-the-art OFDM TXs. Several circuit-design techniques such as LSB truncation error feedback are proposed to efficiently...
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