题目/Title：A 5-mW 750-kb/s Noninvasive Transceiver for Around-the-Head Audio Applications

作者/Author：
                        Fei Chen,Woogeun Rhee,Zhihua Wang

期刊/Journal：IEEE Transactions on Circuits and Systems II: Express Briefs

年份/Issue Date：2018Feb.

卷（期）及页码/Volume（No.）&pages：Vol.65, No.2, pp. 196 - 200

摘要/Abstract：
This brief presents a noninvasive energy-efficient frequency-modulated ultra-wideband (FM-UWB) transceiver. 8-frequency-shift-keying (FSK) subcarrier modulation is utilized to enhance the data rate with a slight increment of hardware complexity compared to the conventional 2-FSK FM-UWB system. The transmitter employs a fast settling PLL with a pretuned relaxation VCO for 8-FSK subcarrier modulation. The transmitted signal by an FLL-assisted ring VCO followed by a single-stage class AB power amplifier meets the FCC spectrum mask. The regenerative receiver employs a wideband LNA with a stacked structure to save power. Two 4th-order Butterworth bandpass filters and envelope detectors convert the FM signal to an AM signal with good linearity. The 3.5-4 GHz 750-kb/s transceiver implemented in 65-nm CMOS consumes 5 mW from a 1-V supply, achieving an energy efficiency of 6.7 nJ/bit.