Michael W. Rawlins - Low Power Wireless Receivers for IoT Applications with Multi-band Calibration Algorithms

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As one considers how the Internet impacts so many activities in daily life, it is difficult to imagine how the modern world would function without it. The Internet helps facilitate education, personal and business communication, interstate commerce, travel, scientific research, and various government functions. Humans derive much, if not most, of their daily news from the Internet. In 2020, with a current world population of 7.8 billion, approximately 4.6 billion people have access to and use the Internet frequently [1]. As more and more humans make use of the Internet, the number of Internet-connected devices is also increasing.

With billions of computers, cellular phones, industrial machines, and appliances connected to the Internet, we find ourselves in the era of the Internet of Things (IoT). According to research from Strategy Analytics, by the end of 2018, the number of devices connected to the Internet reached 22 billion. The number of IoT devices is expected to reach 38.6 billion by 2025, and 50 billion by 2030 [2]. This number of network-connected devices is being driven by desire for automation and data analytics as the demand increases for various commercial, industrial, and infrastructure products. Smart home applications, industrial and banking security, wearable technology, connected health, and industrial appliances are all facilitated by the Internet of Things (IoT) network. Many of these products support remote monitoring and control capabilities via wireless interface.

Devices are often portable and battery powered, having requirements for low power consumption and long battery life while providing desired performance and adequate connectivity. Wearable devices like smart watches and health monitors carry these constraints along with the need to integrate most circuit functions on a single chip to conserve space. Modern deep-submicron CMOS processes facilitate dense integration of radio frequency, analog, digital, and mixed-signal functions on a single die.

This work provides design details for such an application, implementing a low-power wireless receiver fabricated in a popular 28nm CMOS process which considers the aforementioned challenges and constraints. All circuits are designed using a sub-1V power supply.

Chapter demonstrates the performance limits of the calibration loop.

Chapter provides performance details of the receiver.

Several appendices are included which help navigate the reader through design and performance tradeoffs. Included is a detailed TIA analysis, noise figure, distortion analysis and impedance matching of both CMOS and Bipolar LNAs, and a folded-cascode operational amplifier design approach.

was an electrical engineer with 30 years of experience and a patent contributor on more than 100 patents. He graduated from the University of Central Florida in 1989 with a BSEE, emphasis on communication systems theory and analog circuit design. Upon graduation, Michael Rawlins completed additional studies in digital signal processing and random processes. He is recognized by the State of Florida as an Engineer Intern, 1990, No. 489ET333. He began his career with Emerson Electronics and Space while finishing his degree. Michael was a co-founder of Signal Technologies Inc., where he designed discrete and integrated communications subsystems for both government and commercial customers. Michael continued his career with ParkerVision Inc., where he assisted with architecture and design of the Signal-Max wireless-LAN family of products. During his time at ParkerVision Inc., he designed integrated transmitter and receiver systems targeting cellular and other wireless applications. Michael was also employed by Lockheed Martin Corporation, working on various programs. Dedicated husband and father (1959-2020).