A Reference-Less Ultra-Low Power Wake-Up Receiver with Double-Sampling Technique for Wireless Sensor Networks

• Main Authors: Jhih-SyuanLin, 林志軒
• Other Authors: Kuang-Wei Cheng
• Format: Others
• Language: en_US
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/w39tka

碩士 === 國立成功大學 === 電腦與通信工程研究所 === 104 === This thesis presents an on/off keying wake-up receiver (WuRx) for ultra-low applications. Due to the double-sampling technique and passive amplification of the RF gain stage, the 2.4 GHz WuRx achieves -51.5 dBm sensitivity at 200 kbps while consuming 25 μW from a 1V supply without LNA, VCO and external reference frequency. The envelope-detection technique is employed to eliminate the power-hungry LO generation in a super-heterodyne receiver. In addition, the passive amplification of the input matching network is employed to remove the power-thirsty LNA. At the baseband, the data is synchronized with the bit clock, which is generated from the clock and data recovery (CDR) circuit. The CDR consists of a clock recovery circuit (CRC) and D flip-flop. The CRC includes an injection-locked oscillator (ILO) and a short pulse generator. The clock is multiplied by 4 for generation of sampling clocks. The sampling clocks are used to sample the RF and IF signals to achieve a double-sampling technique and to remove 1/f noise and offset voltage. The WuRx is fully integrated except an external input matching network. A prototype is fabricated in 90 nm TSMC technology. The chip area is 1 × 0.95 mm2.