JSSC 2013第11期RF & Wireless0.18μm CMOS

An Asymmetrical QPSK/OOK Transceiver SoC and 15:1 JPEG Encoder IC for Multifunction Wireless Capsule Endoscopy Yu a n G a o, Member , IEEE

本文提出了一种用于无线胶囊内窥镜的非对称QPSK/OOK收发器SoC和JPEG图像编码器芯片组。

QPSK TX功耗5mW，输出功率6dBm，数据率3Mb/s；OOK RX灵敏度-65dBm，数据率500kb/s，功耗4.5mW

无线胶囊内窥镜QPSK/OOK收发器JPEG编码器低功耗子采样技术

▸创新点1：非对称QPSK/OOK收发器SoC采用双调制模式（QPSK和OOK）实现高低数据速率并存传输，QPSK调制支持3 Mb/s高数据速率图像传输，OOK调制提供500 kb/s低数据速率命令链路，系统集成度高且功耗优化（QPSK TX功耗5 mW，OOK RX灵敏度-65 dBm）。

▸创新点2：低功耗JPEG编码器通过YUV色彩平面子采样技术实现高达15:1的压缩比，显著降低图像传输功耗，支持无线胶囊内窥镜的实时图像处理（平均功耗2.5 mW@3 fps），属于算法与硬件协同优化创新。

▸创新点3：子采样技术在YUV色彩平面中的应用创新性地平衡了图像质量与压缩效率，通过选择性降采样减少数据量，同时保持临床可接受的图像分辨率，属于信号处理领域的创新。

▸创新点4：系统级验证通过体内动物实验证明芯片组实际性能，将理论设计与医疗应用场景紧密结合，验证了收发器与编码器在真实生物环境中的可靠性与功耗表现（实测TX平均功耗2.5 mW）。

Abstract

This paper presents a chipset including an asymmet- rical 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 m CMOS, the QPSK TX consumes 5 mW at 6d B mo f 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 capsul e has been implemented with the chipset and the performance has been veri ﬁed 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.