CMOS radar-on-chip system has integrated antennas

June 12, 2018 // By Julien Happich
Researchers from Belgium's nanoelectronics innovation center Imec have developed what they believe to be the world’s first CMOS 140GHz radar-on-chip system with integrated antennas in standard 28nm technology.

Announced at the International Microwave Symposium (IMS, Philadelphia, USA), the chip represents an important step in the development of radar-based sensors for a myriad of smart intuitive applications, such as building security, remote health monitoring of car drivers, breathing and heart rate of patients, and gesture recognition for man-machine interaction.

If designed much smaller, cheaper and power efficient than todays' solutions, radars could enable contactless, non-intrusive interaction in many IoT applications including people detection and classification, vital signs monitoring and gesture interfacing. The chip-based low-power 140GHz radar solution demonstrated by imec is a proprietary two antenna SISO (Single Input Single Output) radar transceiver chip and a frequency modulated continuous wave phase-locked loop (FMCW PLL), off-the shelf ADCs and FPGA and a Matlab chain.

The transceiver features on-chip antennas achieving a gain close to 3dBi. The excellent radar link budgets are supported thanks to the transmitter Effective Isotropic Radiated Power (EIRP) exceeding 9dBm and a receiver noise figure below 6.4dB. The total power consumption for transmitter and receiver remains below 500mW, which can be further reduced by duty cycling. The FMCW PLL enables fast slopes up to 500MHz/µs over a 10GHz bandwidth around 140GHz with a slope linearity error below 0.5% and has a power consumption below 50mW.

The FPGA contains real-time implementation of basic radar processing functions such as FFTs (Fast Fourier Transforms) and filters, and is complemented by a Matlab chain for detections, CFAR (Constant False Alarm Rate), direction-of-arrival estimation and other advanced radar processing.

“With our prototype radar, we have demonstrated all critical specs for radar technology in 28nm standard CMOS technology,” said Wim Van Thillo, IoT program director at imec.

“We are well advanced in incorporating multiple antenna paths in our most recent generation solution, which will enable a fine angular resolution of 1.5cm in a complete MIMO radar form factor of only a few square centimeters. We expect this prototype in the lab by the end of


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