A 2.4 GHz ULP OOK Single-Chip Transceiver for Healthcare Applications

摘要

This paper describes an ultra-low power (ULP) single chip transceiver for wireless body area network (WBAN) applications. It supports on-off keying (OOK) modulation, and it operates in the 2.36–2.4 GHz medical BAN and 2.4–2.485 GHz ISM bands. It is implemented in 90 nm CMOS technology. The direct modulated transmitter transmits OOK signal with 0 dBm peak power, and it consumes 2.59 mW with 50% OOK. The transmitter front-end supports up to 10 Mbps. The transmitter digital baseband enables digital pulse-shaping to improve spectrum efficiency. The super-regenerative receiver front-end supports up to 5 Mbps with $-75~{rm dBm}$ sensitivity. Including the digital part, the receiver consumes 715 $mu {rm W}$ at 1 Mbps data rate, oversampled at 3 MHz. At the system level the transceiver achieves ${rm PER}=10 ^{-2}$ at 25 meters line of site with 62.5 kbps data rate and 288 bits packet size. The transceiver is integrated in an electrocardiogram (ECG) necklace to monitor the heart's electrical property.