본 논문은 ASK(amplitude shift keying) 수신기 칩인 AS3933을 이용하여 900 MHz 대역에서 동작하는 저전력 WuRx(wake up receiver) 모듈을 제작 및 측정한 결과를 기술한다. RF 포락선 검파 방식의 WuRx는 전력 소모가 적은 장점 이 있지만, 수신 감도가 낮은 단점이 있다. 따라서 본 연구는 저전력 조건을 유지하면서 수신 감도를 높이기 위해서 안테 나 임피던스 정합회로, 배전압 정류 구조의 포락선 검파기, 리플을 제거하기 위한 형태의 LC 필터 그리고 5차 체비셰프 저역 통과 필터를 적용하여 WuRx를 설계하였다. 제작된 WuRx는 3.3 V에서 동작하며 전송률 2.52 kbps에서 전류는 619 μA가 소모되었고, −52 dBm 수신 전력에 PER(packet error rate) 1 %로 측정되었다.
This work reports a 900 MHz wake-up receiver developed using 0.18 μm CMOS technology to reduce the power consumption of a Wireless Sensor Node(WSN). It employs the on-off-keying(OOK) modulation scheme for low power operation. N-path passive filters and an ultra-low power LC digitally controlled oscillator(LC-DCO) were designed. Additionally, a Dual-IF was adopted for lower sensitivity. The chip was tested at 1.2 V supply for low power operation. The measured results showed that the sensitivity and power consumption were −84 dBm and 148 μW, respectively, with a 10 kbps data rate and bit error rate(BER) of 10 −3 .
This paper presents an envelope detector-based wake-up receiver (WuRx) fabricated using a 0.18 μm CMOS process. The front end of the WuRx was designed as a CMOS Dickson rectifier with no power consumption, and an off-chip matching network was designed at a carrier frequency of 433 MHz. This WuRx used a 32-bit pulse width modulation (PWM) code along with on-off-keying. The clock and data were successfully recovered from the received PWM signal, and a digital correlator was designed that detects the wake-up signal through comparison with the ID code. The fabricated chip was tested with a 0.5 V single supply. The total power consumption was 48 nW and the sensitivity was −63.8 dBm at a data rate of 1 kbps.
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