Fujitsu develops world’s first On-chip CMOS power detector with built-in temperature compensation

Fujitsu today announced that it has developed a CMOS power detector with built-in temperature compensation, featuring a compact design and low power consumption suitable for use in smartphones and other mobile terminals. Reducing the mounted area required for components and circuits in mobile terminals is an important factor in reducing their size and cost, but they occupy a relatively large mounted area, because the power detectors used in the transmitters for wireless communications terminals are typically comprised of several radio-frequency (RF) amplifiers.

Diodes are known to be an alternative for making power detectors smaller, but their characteristics change with temperature, and the temperature compensation they require has been problematic. Fujitsu Laboratories has developed a diode-based power detector with a technology that simultaneously enables temperature compensation, resulting in a power detector with a mounted area of only 0.04 mm2 and power consumption of 0.3 mW. Compared to conventional detectors, this requires less than 1/25th the mounted area and consumes 1/10th the power, contributing to smaller, less expensive mobile terminals.

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