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 currentreuse architecture. The detector sensitivity is enhanced through an embedded matching network with signal passive amplification. A prototype receiver is fabricated in 0.18-mu m CMOS technology with a core size of 0.46 mm(2). 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 mu W 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.