The demand for medical electronic devices, both smaller and smarter, is a key driving force behind integrated circuits and systems development. Implantable medical devices (IMDs), fully or partially implanted into the human body through surgery, have a set of strict technical requirements for information transfer between the external host devices (EHDs) and IMDs. They include the choice of frequency and bandwidth, power consumption, data rate, signal modulation scheme, disturbance, and interference. The miniaturization of IMDs makes the power supply design especially challenging. In order to power miniaturized IMDs, wireless power delivery (WPD) or wireless power transfer (WPT) is desirable. In a WPT system, improving the energy efficiency is a very important objective. The energy transfer efficiency should be as high as possible despite large variations in coupling and loading conditions. This lecture comprises three parts. First, a recent radio transceiver design technique to reduce power consumption and area is proposed. A set of miniature IMDs has been implemented using this ultra-low power transceiver which can be integrated in different application-specific system-on-chip. Second, critical techniques for improving energy efficiency are addressed. Approaches include tracking the maximum efficiency point with a low-cost method, optimizing the efficiency of rectifiers and inverters, implementing a power control loop between transmitter and receiver, and increasing the quality factor of loop antenna coils and coupling coefficient between coils. Finally, system-level implementations of popular biomedical applications, such as involve Gastric Electric Stimulator, Hearing Aid System, and digestive Tract Endoscopy System, are presented.

Biography:

Zhihua Wang received the B.S., M.S., and Ph.D. degrees in Electronic Engineering in 1983, 1985 and 1990, respectively, from Tsinghua University, Beijing, China, where he has served as full professor and Deputy Director of the Institute of Microelectronics since 1997 and 2000. He was a visiting scholar at CMU (1992-1993) and KU Leuven (1993-1994), and was a visiting professor at HKUST (2014.9-2015.3). His current research mainly focuses on CMOS RFIC and biomedical applications, involving RFID, PLL, low-power wireless transceivers, and smart clinic equipment combined with leading edge RFIC and digital image processing techniques. An IEEE Fellow, he has co-authored 12 books/chapters, over 197 (514) papers in international journals (conferences), over 246 (29) papers in Chinese journals (conferences) and holds 118 Chinese and 9 US patents. Prof. Wang has served as the chairman of IEEE SSCS Beijing Chapter (1999-2009), an AdCom Member of the IEEE SSCS (2016-2019), a technology program committee member of the IEEE ISSCC (2005-2011), a steering committee member of the IEEE A-SSCC (2005-), the technical program chair for A-SSCC 2013, a guest editor for IEEE JSSC Special Issues (2006.12, 2009.12 and 2014.11), an associate editor of IEEE Trans on CAS-I, II and IEEE Trans on BioCAS, and other administrative/expert committee positions in China’s national science and technology projects.