30.8 A 3.5mm×3.8mm Crystal-Less MICS Transceiver Featuring Coverages of ±160ppm Carrier Frequency Offset and 4.8-VSWR Antenna Impedance for Insertable Smart Pills

作者：Minyoung Song, Ming Ding, Evgenii Tiurin, Kai Xu, Erwin Allebes, Gaurav Singh, Peng Zhang, Stefano Traferro, Hannu Korpela, Nick Van Helleputte, Robert Bogdan Staszewski, Yao‐Hong Liu, Christian Bachmann · 年份：2020 · DOI：10.1109/isscc19947.2020.9063083 · 被引用次数：15 · 研究领域：Wireless Body Area Networks、Energy Harvesting in Wireless Networks、Wireless Power Transfer Systems

Gastroscopy is a common diagnosis method for gastrointestinal (GI) diseases, but it needs to be performed in hospitals. Existing ingestible pills can collect patients' GI information over a longer period outside of a hospital, and various sensors can be incorporated to collect more information. However, ingestible pills passing through the GI system cannot make long recordings in specific places of interest. New gastroscope research focuses on the use of the biopsy channel of an insertion tube to attach the pill on a specific surface of the GI tract for some time before it detaches itself [1]. One of the most challenging parts of such “insertable” pill design is the volume constraint. The biopsy channels in gastroscopes have a diameter of ~3.5mm (at least 3x less than existing pills), and the length of the non-bendable part should be <; 15mm (Fig 30.8.1). Since the pill is at places covered by up to 15cm of tissue, a wireless system operating in the 402-to-405MHz MICS band is preferable because of lower tissue attenuation compared to higher frequency bands, e.g., 2.4GHz. It also provides a longer communication distance and wider signal bandwidth compared to near-field communication systems [2]. Finally, the interference control in MICS ensures the implants having an interference-free channel. However, the volume constraint poses significant challenge for a MICS transceiver design because external components should be avoided, and it interfaces with an electrically small ( (10...