05 June, 2017
Mie Fujitsu Semiconductor Limited
Higashihiroshima and Yokohama, Japan, June 5, 2017 - Hiroshima University and Mie Fujitsu Semiconductor Limited (MIFS) today announced the development of a low-power millimeter-wave amplifier that feeds on 0.5 V power supply and covers the frequency range from 80 GHz to 106 GHz.It was fabricated using MIFS's Deeply Depleted Channel (DDC) technology. This is the first W-band (75-110 GHz) amplifier that can operate even with such a low power-supply voltage. Details of the technology will be presented at the IEEE Radio Frequency Integrated Circuits Symposium (RFIC) 2017, running from June 4th to 6th in Honolulu, Hawaii*.
The W-band covers the frequencies used by automotive radars. Sophisticated driver-assistance and self-driving will require radars with millimeter-wave beam scanning capability that can "see" day and night and even in adverse weather conditions. Such a "phased array" will consist of up to hundreds of transmitters and receivers. Given the fact that even cars are becoming battery-operated, it is imperative that these circuits be low-power. Lowering the power-supply voltage is the most effective means of accomplishing that. However, transistor performance drops with voltage and no W-band amplifier has so far operated at as low as 0.5 V. The team of researchers successfully demonstrated a W-band amplifier at 0.5 V by bringing together MIFS’s DDC technology and design techniques developed by Hiroshima University. The DDC technology offers high-performance silicon MOS transistors even at low voltages and is currently available from MIFS as a 55-nm CMOS process. The design techniques further improve transistor and circuit performance at millimeter-wave frequencies.
Short-range Radars Deployed Everywhere
IMAGE: Millimeter-wave radars covering several tens of meters could be on cars, bikes, and smartphones. This might create a lot of new applications including games. (Hiroshima University)
"Now that seriously low-power W-band circuits seem really possible, we should think about what we can do with them. Applications aren't limited to automotive radars and high-speed communications between base stations. What if you have a radar on your smartphone? Today's smartphones can already sense things like acceleration, audible sound, visible light, and Earth's magnetic field. But the only active probing device is that tiny LED (light-emitting diode) that can illuminate at most a few meters. Add a millimeter-wave radar on a smartphone, and it doesn't have to be a so-called primary radar, which only detects waves reflected back. Your smartphone could respond to waves from your friend's radar and send some signal back. A whole lot of new applications could be created including games," said Prof. Minoru Fujishima, Graduate School of Advanced Sciences of Matter, Hiroshima University.
"Another significance of our 0.5-V W-band amplifier is reliability. We researchers know that some millimeter-wave circuits presented at major conferences, biased at 1 V or higher, won't last long. They degrade as you measure them, within days or even hours, not years, because of the so-called hot-carrier effects. You wouldn't want to get on a car that loses its sight so quickly. The 0.5-V supply voltage will significantly reduce hot-carrier generation," Prof. Fujishima added.
"Compared to conventional CMOS, our DDC transistors offer excellent performance in low-power operations. We have proven that we can extend those outstanding qualities to the millimeter band. I am delighted that our collaboration with Hiroshima University has produced a millimeter-band amplifier. We plan to move forward by building a design environment for maximizing the capabilities of DDC technology," said Mutsuaki Kai, Vice President of Technology Development, Mie Fujitsu Semiconductor.
The research group plans to continue exploring the possibility of low-voltage millimeter-wave CMOS circuits.
*:K. Katayama, S. Amakawa, K. Takano, T. Yoshida, M. Fujishima, K. Hisamitsu, and H. Takatsuka, "An 80-106 GHz CMOS amplifier with 0.5 V supply voltage," IEEE Radio Frequency Integrated Circuits Symposium (RFIC), June 2017.
Mie Fujitsu Semiconductor is a pure-play foundry company based on 300mm wafer manufacturing facilities located in Kuwana city, Mie, Japan. Headquartered in Yokohama, it was established as a subsidiary of Fujitsu Semiconductor Limited on December 1, 2014. UMC became its minority shareholder in March 2015. Mie Fujitsu Semiconductor provides high-quality technology and services, with wide-ranging expertise focusing on Ultra-Low-Power, Non-Volatile Memory and RF Technology. For more information, please see: http://www.fujitsu.com/jp/mifs/en/
In collaboration with CSEM of Switzerland, MIFS is developing an energy-efficient technology platform using a 0.5 V standard, called "C55DDC." The PDK design environment already supports mixed-signal and RF design using this platform, and is due to support standard cell, SRAM/ROM basic library sets, ADC/DAC. PMU (Power Management Unit), BLE (Bluetooth® Low Energy), and flash IP features by the end of 2017.
DDC technology is suited for low-power and analog circuits due to its low variability between devices, and it has high body-bias sensitivity compared to conventional transistors, which makes it easier to adjust the transistor properties for specific product specifications. DDC is particularly well suited to the burgeoning fields of IoT and wearables.
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