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New chip for waking up wireless devices could extend battery life

By only waking up a wireless device when necessary, the wake-up receiver (chip stack to the left of the penny) can cut down on power use and extend battery life. The system includes a miniaturised antenna (gold-coloured plate below the receiver).

A new power saving chip could significantly reduce or eliminate the need to replace batteries in Internet of Things (IoT) devices and wearables.

The ‘wake-up receiver’ awakens a device only when it needs to communicate and perform its function. That means the device can stay dormant the rest of the time, which reduces power use.

The technology was developed by engineers at the University of California San Diego, who say that it is useful for applications that do not always need to be transmitting data.

Examples of such devices include IoT devices that consumers use to reorder household items, or wearable health monitors that take readings a handful of times a day.

"The problem now is that these devices do not know exactly when to synchronise with the network, so they periodically wake up to do this even when there's nothing to communicate. This ends up costing a lot of power," said Patrick Mercier, a professor of electrical and computer engineering at UC San Diego.

"By adding a wake-up receiver, we could improve the battery life of small IoT devices from months to years."

The wake-up receiver is an ultra-low power chip that continuously looks out for a specific radio signal, called a wake-up signature, that tells it when to wake up the main device. It needs only a very small amount of power to stay on and do this.

A key part of this receiver's design is that it targets higher frequency radio signals than other wake-up receivers. The signals are in the frequency of 9 gigahertz, which is in the realm of satellite communication, air traffic control and vehicle speed detection.

Targeting a higher frequency allowed researchers to shrink everything, including the antenna, transformer and other off-chip components down into a much smaller package--at least 20 times smaller than prior nanowatt-level work.

The team was led by Mercier and UC San Diego electrical and computer engineering professors Drew Hall and Gabriel Rebeiz.

Charlotte Hathway

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