An Ultralow-Power Wake-Up Receiver Based on Direct Active RF Detection

An ultralow-power direct active RF detection wake-up receiver (WuRx) is presented. In order to reduce the power consumption and system complexity, a differential RF envelope detector is implemented in a complementary current-reuse architecture. The detector sensitivity is enhanced through an embedded matching network with signal passive amplification. A prototype receiver is fabricated in 0.18-μm CMOS technology with a core size of 0.46 mm². At the operating frequency of 2.4 GHz, the receiver achieves a-50 dBm sensitivity [10^-3 bit error rate (BER)] at a data rate of 200 kbps while consuming 4.5 μW from a 0.8 V supply voltage. The WuRx is capable of achieving a 10^-3 BER for 200 kb/s data rate with a signal to interference ratio greater than-30 dB at ±10 MHz offset.