A design of a high-speed and high-efficiency capsule endoscopy system.
This paper presents a high-speed and high-efficiency capsule endoscopy system. Both a transmitter and a receiver were optimized for its application through an analysis of the human body channel. ON-OFF keying modulation is utilized to achieve low power consumption of the in-body transmitter. A low drop output regulator is adopted to prevent performance degradation in the event of a voltage drop in the battery. The receiver adopts superheterodyne structure to obtain high sensitivity, considering the link budget from the previous analysis. The receiver and transmitter were fabricated using the CMOS 0.13-μm process. The output power of the transmitter is -1.6 dB·m and its efficiency is 27.7%. The minimum sensitivity of the receiver is -80 dB·m at a bit error ratio (BER) of 3 × 10 (-6). An outer wall loop antenna is adopted for the capsule system to ensure a small size. The integrated system is evaluated using a liquid human phantom and a living pig, resulting in clean captured images.
Applied Electromagnetics Laboratory, School of Electrical Engineering, Seoul National University, Seoul, Korea. kihyun@ael.snu.ac.kr
Kihyun
K
Kim
Sumin
S
Yun
Sungho
S
Lee
Sangwook
S
Nam
Young Joong
YJ
Yoon
Changyul
C
Cheon
D000818:Animals; D053705:Capsule Endoscopes; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006801:Humans; D007089:Image Enhancement / Q000295:instrumentation*; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D013552:Swine; D013686:Telemetry / Q000295:instrumentation*