Low power radios are in high demand for use in Internet of Things (IoT) devices, where there is a need for small, efficient, and low powered radios for wireless data communications. This book is part of Springer’s “Analog Circuits and Signal Processing” series, which publishes “research on the design and applications of analog integrated circuits and signal processing circuits and systems.” Rahman and Harjani detail their design for radios complying with the IEEE 802.15.6 standard for IoT applications. In particular, they focus on applications for radios in medical devices and sensors used in and around the human body, generally referred to as wireless body area networks (WBANs).
The first chapter introduces the characteristics required for low power radio transceivers used for wireless communications between WBAN devices and IoT devices in general, and also introduces the general organization of the rest of the book. Chapter 2 introduces the authors’ IEEE 802.15.6 compliant transmitter for WBAN applications. Rahman and Harjani provide an overview of their transmitter’s design and specifications. Discussion covers differential quadrature phase shift keying (DQPSK) modulation, a class AB power amplifier, and other techniques used to deliver a robust, high efficiency, and very low power consumption transmitter for WBAN applications. Not simply an academic proposal, however, performance test measurements for the prototype of the transmitter are provided, well supported with diagrams and illustrations.
Chapter 3 describes the design of the RF mixer frontend for a receiver that uses frequency translated mutual noise cancelling (FTMNC). The system design and specifications are described, with particular detail on the noise cancellation techniques employed in the receiver. Again, performance test measurements for the prototype are presented and discussed. Chapter 4 describes the low noise amplifier (LNA) design for the receiver frontend. The design uses “dual-path noise and nonlinearity cancellation for [better] noise performance,” improving the receiver’s figure of merit (FOM) over current state-of-the-art designs as well as reducing power requirements. Theoretical analysis, as well as actual test results from the prototype, are presented and discussed. Chapter 5 combines the components into a functioning radio transceiver for low power IoT applications. A system overview is described, fabrication techniques discussed, and the test result measurements from the prototype are presented.
The last chapter concludes with a summary of the sub-harmonic injection locking (SHIL) techniques, details of the phase locked loop running at very low frequency and other techniques used to reduce transmitter power consumption, along with the noise cancelling techniques used in the receiver to deliver a radio that is ideal for the needs of IoT wireless data communications.
Each chapter is well supported by clear and relevant diagrams and illustrations, there is a detailed table of contents and good index, and each chapter concludes with detailed references. The authors describe a radio transceiver that seems to be ideal for IoT applications. Rather than simply an academic exercise, the authors present test results from measurements conducted on prototype devices that provide supporting evidence for their claims. As IoT devices proliferate in our world, simple data communications radios with very low power requirements, such as the one developed by the authors, are becoming a necessity.