Dynamic range expansion amplifier to measure the slow wave signal from the intestine by telemetry capsule

Recently, various capsule endoscope systems have been developed, and it is possible measure various bio signal from the human to diagnosis a disease. There have been numerous studies of the myoelectric activity in a stomach, but only a few studies of the small intestines, because, there was no way to measure the signal by non-invasive method. Therefore, it is necessary to research myoelectric measurable telemetry capsule. In this paper, main focuses are implement swallowable telemetry capsule, and enough working time for future clinical experiments. The capsule use dynamic range expansion technique to reduce size of the amplifier, and reduce average power consumption as 3.6 mW; therefore, the capsule can use small batteries, that could be implemented as swallowable size. The capsule is verified by in-vitro experiment, and it amplifies the signal properly.