A mixed-signal CMOS circuit design of a smart RF ID tag for heartbeat signal extraction is proposed. This smart RF ID tag has been under development for monitoring heartbeat signals from an electrocardiogram (ECG) microsensor and/or a pressure microsensor implanted in a transgenic animal. This tag is remotely powered by RF electromagnetic induction. The signal packet consisting of an identification code of 64 bits in length and a spike-pulse sequence of heartbeat signals are transmitted to a reader system using BASK modulation.

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In recent years, interest in IoT (Internet of Things) has been increasing, and energy harvesting has attracted attention. However, the power and voltage that can be harvested are very small. Therefore, a power supply circuit is required to solve this problem. In this paper, we have realized a boost circuit that does not require a coil with the aim of integrating all the circuits required for sensing on one chip.

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