Self-Powered Short-Range Wireless System with MTCMOS/SOI LSIs

Ultralow-power MTCMOS/SOI technology enables self-powered wireless transmission by just touching a terminal

Ultralow-power LSIs with 1- to 10-mW power dissipation should open the way to self-powered short- range wireless systems that use ambient energy sources, such as the light, kinetic and thermal energy sources around us.

The MTCMOS/SOI circuit technology makes it possible to achieve such ultralow-power operation by reducing the supply voltage down to 0.5V. The MTCMOS/SOI circuit is based on fully-depleted (FD) SOI MOSFETs and is composed of low-, medium-, and high-Vth (threshold voltage) MOSFETs. The low-Vth FD-SOI CMOS blocks perform high-speed operation at 0.5V. The medium-Vth CMOS blocks suppress the leakage current in the active mode, and the high-Vth power-switch transistor reduces the leakage current in the sleep mode.

A self-powered short-range wireless system for the 300-MHz unlicensed radio band employs 0.5~1-V digital and RF LSIs with MTCMOS/SOI technology. The power sources of the transmitter and receiver are a micro-thermoelectric generator and a solar cell. The transmitter uses the heat from a hand, and it supplies a power of 1 mW to the LSIs. The system can transmit data up to a distance of five meters and display data on the LCD without a battery.

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