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Title: Area and Power Efficient Receiver for Narrowband Internet of Things Applications
Author: Nishant Patil{1}, Sankaran Aniruddhan{2}
Affiliation: {1}Columbia University in the City of New York, United States; {2}Indian Institute of Technology Madras, India


Abstract: The expected extensive deployment of Narrow Band IoT devices imposes stringent constraints on the power and cost of individual transceivers. In this work, an inductor-less, wideband, low-power receiver has been presented that can be easily integrated into end-to-end NB-IoT remote sensors. The direct-conversion receiver comprises the Low Noise Amplifier, IQ downconversion mixer, and the LO divider while also implementing a single-pole baseband filter response. The prototype IC has been designed and fabricated in a TSMC 65nm CMOS process, and the measurement results validate the analysis, design, and performance of the front-end system. The wideband receiver covers all NB-IoT bands up to 2.5 GHz and employs 28.5 dB gain control to reduce power consumption based on received signal strength. The receiver gives a measured maximum gain of 42.1 dB with a noise figure of 4.2 dB while consuming 6.5 mW of power. The receiver occupies an area of 0.48 mm^2 and satisfies all noise and linearity specifications as per 3GPP standards for NB-IoT systems.