A baseband circuit for wake-up receivers with double-mode detection and enhanced sensitivity robustness

• Published in: Journal of semiconductors Vol. 34; no. 8; pp. 144 - 149
• Main Author: 朱文锐 杨海钢 高同强 刘飞 程小燕 张丹丹
• Format: Journal Article
• Language: English
• Published: 01.08.2013
• Subjects: Bandpass filters; Cancellation; Circuits; CMOS; Power supplies; Receivers; Robustness; Semiconductors; 双模式; 基带电路; 接收器; 敏感性; 电子不停车收费系统; 频率检测; 高灵敏度; 鲁棒性
• ISSN: 1674-4926
• DOI: 10.1088/1674-4926/34/8/085011

This paper proposes a baseband circuit for wake-up receivers with double-mode detection and enhanced sensitivity robustness for use in the electronic toll collection system.A double-mode detection method,including amplitude detection and frequency detection,is proposed to reject interference and reduce false wake-ups.An improved closed-loop band-pass filter and a DC offset cancellation technique are also newly introduced to enhance the sensitivity robustness.The circuit is fabricated in TSMC 0.18μm 3.3 V CMOS technology with an area of 0.12 mm2.Measurement results show that the sensitivity is -54.5 dBm with only a±0.95 dBm variation from the 1.8 to 3.3 V power supply,and that the temperature variation of the sensitivity is±1.4 dBm from -50 to 100℃. The current consumption is 1.4 to 1.7μA under a 1.8 to 3.3 V power supply.