A design of a high-speed and high-efficiency capsule endoscopy system

Kihyun Kim, Sumin Yun, Sungho Lee, Sangwook Nam, Young Joong Yoon, Changyul Cheon

Research output: Contribution to journalArticlepeer-review

46 Scopus citations


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 x 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.

Original languageEnglish
Pages (from-to)1005-1011
Number of pages7
JournalIEEE Transactions on Biomedical Engineering
Issue number4
StatePublished - Apr 2012


  • Automatic gain controller (AGC)
  • CMOS radio frequency (RF) integrated circuit
  • ON-OFF Keying (OOK) modulator/demodulator
  • wireless body area network


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