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

作者：Chen, Fei^*; Rhee, Woogeun; Wang, Zhihua

来源：IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS, 2018, 65(2): 196-200.

DOI：10.1109/TCSII.2017.2710266

• FM-UWB transceiver
• 8-FSK subcarrier
• fast-settling PLL
• regenerative receiver

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.

• 出版日期2018-2
• 单位清华大学; 天津大学