A Multiband Ultralow-Power Transceiver with Two-Step Wake-Up Reception

This letter presents a multiband fully integrated ultralow-power (ULP) transceiver with a two-step wake-up receiver (WuRX) and switched-capacitor (SC)-based high-efficiency transmitter. Operating from 200 MHz to 1 GHz, the transceiver covers most IoT applications on a single chip. By employing a novel two-step wake-up scheme with a rotating correlator, the proposed ULP WuRX consumes only 6.7μ W in duty-cycling mode while achieving -125- and -120-dBm sensitivities at 200 MHz and 1 GHz, respectively, with less than 10% packet error rate. The SC power amplifier (SCPA)-based transmitter offers a 40.8-dB dynamic range (-30 to 10.8 dBm) and 40.9% maximum efficiency at 200 MHz, with precise linear variable gain. The RX and TX share a local oscillator signal from a wide frequency-range fractional-N PLL. Implemented in 55-nm CMOS, the transceiver occupies 2.6× 4.7 mm. The radio supports BFSK modulation with data rates up to 1 Mb/s.