A 184-nW, −78.3-dBm Sensitivity Antenna-Coupled Supply, Temperature, and Interference-Robust Wake-Up Receiver at 4.9 GHz
Xiaochuan Shen, Divya Duvvuri, Pouyan Bassirian, Henry L. Bishop, Xinjian Liu, Anjana Dissanayake, Yaobin Zhang, Travis N. Blalock, Benton H. Calhoun, Steven M. Bowers
Abstract
This article presents a highly integrated, supply, temperature, and interference-robust, event-driven wake-up receiver (WuRx) achieving <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$< -78.3$ </tex-math></inline-formula> -dBm sensitivity using a custom-designed antenna at 4.9 GHz or <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$< -72.3$ </tex-math></inline-formula> -dBm sensitivity when matched to a 50- <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\Omega $ </tex-math></inline-formula> source at 5.3 GHz, consuming 184 nW at room temperature. The chip is fabricated in 65-nm CMOS LP technology and powered by a single supply. A novel slot antenna is proposed to directly conjugate match to the input of the chip and eliminate lossy impedance matching networks. The integrated references and regulation enable the receiver to operate for a wide range of temperatures from <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$-30\,\,^\circ \text{C}$ </tex-math></inline-formula> to 70 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$^\circ \text{C}$ </tex-math></inline-formula> and a supply range from 1.2 to 1.5 V. The integrated proportional–integral–derivative (PID) control module allows the WuRx to automatically adapt for different temperatures and interference signals present in the ambient environment.