A 2mW CMOS MICS-band BFSK transceiver with reconfigurable antenna interface

A 0.18µm CMOS MICS-band transceiver with a reconfigurable RF front-end is presented, reusing the same circuit core for super-regenerative wake-up receiver, receive-mode LNA, and transmit power amplifier, eliminating the need for an external T/R switch. The transceiver uses an All Digital Frequency Locked-Loop (ADFLL) for LO signal generation and transmitter's modulation. The OOK wake-up receiver sensitivity is −80dBm @ 50kbps, while the BFSK receiver's sensitivity is −97dBm for a 75kbps signal and 2mW power consumption. The nominal output power of the transmitter is −5dBm.