📋 Tender Overview
At this weeks International Solid-State Circuits Conference ISSCC imec a world-leading research and innovation hub in nanoelectronics and digital technologies showcases the first IEEE 802.15.4z impulse-radio ultra-wideband IR-UWB transmitter chip striking a balance between UWBs accurate and secure ranging capabilities for indoor localization and the need for increased energy efficiency.Fabricated in 28nm CMOS with an occupied core area of only 0.15mm the chip aims to enable the next generation of cost-effective small form-factor UWB deployments. It has been custom-developed to achieve a record-low power consumption of 4.9 milliwatt mW in a standard-compliant operation while adhering to UWBs stringent spectral emission regulations. It is also the first sub-5mW IR-UWB transmitter chip to comply with the newly released IEEE 802.15.4z standard for even more accurate and secure UWB ranging measurements.Indoor localization and micro-location applications are becoming increasingly popular. Think of keyless entry solutions for vehicles hotels and office buildings and asset tracking in warehouses or factories. Intrinsically ultra-wideband technology is perfectly suited to accommodate accurate and secure ranging for indoor localization use-cases. Even more so since last years introduction of the IEEE 802.15.4z standard enhancing UWBs physical layer to increase its ranging measurements integrity and accuracy. Yet UWBs power budget has been limiting the technologys widespread adoption in favor of its Bluetooth Low Energy BLE contender which came with a power consumption that is more than 10 times lower.Hence the IR-UWB transmitter chip we showcase at ISSCC is no less than a gamechanger in the domain of high-accuracy and secure ranging for indoor localization explains Christian Bachmann program manager UWB and Bluetooth Secure Proximity at imec. Its innovative digital-intensive architecture has been fabricated in a 28nm CMOS process leading to an area use of only 0.15mm. And it comes with a record-low power consumption of 4.9mW which is ten times lower than the power budget of state-of-the-art UWB products.This research effort is part of imecs strategy to make UWB an ultra-low-power and cost-effective technology option for a new generation of small battery-powered micro-location and indoor localization use-cases he adds.The chip builds on an innovative digital polar transmitter architecture to significantly reduce the ICs power consumption to only 4.9mW. Additionally injection-locked ring oscillator ILRO technology allows to achieve even greater power savings by enabling fast duty cycling between the IR-UWB transmitters signal bursts within a packet and allowing parts of the transmitter to be turned off between those pulses.Equally important imecs IR-UWB transmitter chip complies with the stringent worldwide spectrum regulations that dictate in which frequencies the UWB transmitter can emit as to avoid interference with other wireless services. To that end the imec researchers propose an asynchronous pulse shaping design that meets the international spectral emission regulations in the 3-10GHz bands while allowing the transmitter to operate closely to the maximum power spectral density PSD. This breakthrough is the latest addition to imecs track record when it comes to the development of micro-location technologies and ultra-low-power digital RF circuits. Yet our ambition reaches much further than developing a sole UWB transmitter. What we are working towards is the design of a complete transceiver including novel high-performance ranging direction finding and localization algorithms that will allow our partners to fully explore the opportunities brought by next-gen UWB. Opportunities that might even extend to future radar-like applications whereby UWB is not just used to measure the distance between two UWB radios but also to detect passive objects Bachmann concludes.
