A 915 MHz 175 µW Receiver Using Transmitted-Reference and Shifted Limiters for 50 dB In-Band Interference Tolerance

Improving interference robustness in Ultra-Low Power (ULP) receivers is a big challenge due to their low power budget. This paper presents an envelope detector based 915MHz 10kbps ULP receiver, which is fabricated in 65nm CMOS process for Wireless Sensor Networks (WSN) and Internet of Things (IoT). Two power-efficient techniques: Transmitted-Reference and Shifted Limiter, are proposed to improve the interference robustness. The receiver sensitivity is between -61 and -76dBm. The maximum in-band Signal-to-Interference Ratio (SIR) at +/-1MHz offset is up to -50dB while just consuming 175μW power from a 1V supply.