Components | March 30, 2012
TowerJazz and UCSD collaborate
TowerJazz and The University of California, San Diego (UCSD) have collaborated to demonstrate the first wafer-scale phased array with 16 different antenna elements operating at 110 GHz frequency range.
First time success was achieved for the RFIC using TowerJazz’s own proprietary models, kit and the mmWave capabilities of its 0.18-micron SiGe BiCMOS process, SBC18H3. The device targets applications for automotive radar, aerospace and defense, passive imaging, security, and mmWave imaging. The collaboration of the phased array chip was partly funded by DARPA. The wafer-scale SiGe BiCMOS chip is 6.5x6.0mm and combines the 110 GHz source, amplifiers, distribution network, phase shifters and high-efficiency on-chip antennas, allowing a new generation of miniature and low-cost phased arrays for W-band (75-110 GHz) applications. Such an advancement better serves the needs of the greater than $100M emerging markets of auto radar and passive imaging (security). The antennas are integrated on-chip which removes the expensive and lossy transitions and distribution network between the phased array and the off-chip elements. This wafer-scale phased array with 16 radiating elements, together with all the necessary CMOS control circuits, is capable of electronic beam scanning to +/-40 degrees in all planes. The architecture could be scaled to 64 elements (8x8) or 256 elements (16x16) due to on-chip antenna integration and the single chip integration of multiple elements. By developing this wafer-scale chip, UCSD has successfully demonstrated independent amplitude and phase control at 106-114 GHz for all 16 different antenna elements, and provides commercial availability of highly scalable (from 16 elements to 256 elements) RF-IC transmitters for W-Band and D-Band phased array applications. The chip was designed and tested by Woorim Shin, Ozgur Inac, and Bonhyun Ku, all from the Electrical and Computer Engineering Department at UCSD under the supervision of Prof. Gabriel M. Rebeiz, and was partially sponsored by the DARPA GRATE program under the direction of Dr. Carl McCants. The work was done under a subcontract to UCSD from TowerJazz. The phased array chip was developed using TowerJazz’s SBC18H3 BiCMOS which offers both high-performance 0.18-micron SiGe bipolar and high quality passive elements combined with high density 0.18-micron CMOS, to enable high-speed networking and millimeter wave applications. The process offers SiGe transistors with peak Fmax of 280GHz and peak Ft of 240GHz, ideal for low-power, high performance millimeter wave circuits, while replacing the need for more expensive GaAs chips. SBC18H3 comes standard with 1.8 and 3.3 volt CMOS (dual-gate), deep trench isolation, lateral and vertical PNP transistors, MIM capacitors, high- performance varactors, poly-silicon as well as metal and N-well resistors, p-i-n and Schottky diodes, high-Q inductors, triple well isolation, and six layers of metal. “This is yet another advancement in the area of phased arrays that we are proud to announce. We have a track record of successful collaboration with TowerJazz and the ability to bring this innovative design from UCSD to market depends strongly on TowerJazz’s SiGe BiCMOS process which enables lower-cost phased arrays by integrating many functions and high efficiency antennas on the same silicon chip,” said Dr. Gabriel M. Rebeiz, Professor of Electrical Engineering at UCSD, the lead professor on this chip. "We believe the results achieved by UCSD’s phased array transmitter demonstrates the remarkable teamwork between TowerJazz, UCSD and DARPA to provide novel capabilities and technologies to both the aerospace and defense community as well as commercial markets,” said Dr. David Howard, TowerJazz’s Executive Director and Principal Investigator for DARPA GRATE Program. “TowerJazz enjoys the long term, very productive working relationship we have with Dr. Rebeiz, one of the top RF research professors in the world.”
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