Ericsson and Freiburg U. Design High Q Power Harvesting Circuit Using ADS

The Internet of Things (IoT) fulfills a promise of a more efficient and connected world. But with dozens of devices per household, battery management must become wireless and autonomous. This problem is now being solved through power harvesting, which enables a circuit to power itself from energy in the environment. Ericsson’s goal was wireless power transfer of a couple of hundred nanowatts at 1 V to power a sensor node. The transmitted power was at 24 MHz. Keysight’s ADS Harmonic Balance simulator was used to explore the design space around the innovative impedance transformation using a high Q quartz crystal resonator. The resonator could transform the weak harvested signals from the low impedance antenna to a voltage able to forward bias the Schottky diode junction.

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