An Asymmetrical QPSK/OOK Transceiver SoC and 15:1 JPEG Encoder IC for Multifunction Wireless Capsule Endoscopy

作者：Gao Yuan^*; Cheng San Jeow; Toh Wei Da; Kwok Yuen Sam; Tan Kay Chuan Benny; Chen Xi; Mok Wai Meng; Win Htun Htun; Zhao Bin; Diao Shengxi; Cabuk Alper; Zheng Yuanjin; Sun Sumei; Je Minkyu; Heng Chun Huat

来源：IEEE Journal of Solid-State Circuits, 2013, 48(11): 2717-2733.

DOI：10.1109/JSSC.2013.2274894

• JPEG
• OOK
• quadrature phase-shift keying (QPSK)
• transceiver
• wireless capsule endoscopy (WCE)

This paper presents a chipset including an asymmetrical QPSK/OOK transceiver SoC and a JPEG image encoder for wireless capsule endoscopy. The transceiver SoC supports bi-directional telemetry for high data-rate image transmission with QPSK modulation and low data-rate command link with OOK modulation. A low power JPEG encoder is designed to compress raw image data with compression ratio as high as 15: 1 using sub-sampling technique in YUV color plane. Implemented in 0.18 mu m CMOS, the QPSK TX consumes 5 mW at -6 dBm of output power with 3 Mb/s data rate while the OOK RX achieves -65 dBm of sensitivity at 500 kb/s data rate with 4.5 mW power consumption. A prototype capsule has been implemented with the chipset and the performance has been verified with in vivo animal experiment. With duty cycling, the average power consumption of TX is 2.5 mW when transmitting at 3 fps frame rate.

• 出版日期2013-11