Abstract
This article presents the design, optimization and characterization of an ultra-low-power wake-up receiver for embedded wireless sensor nodes. The RF part of the circuit is based on an optimized diode detector for an amplitude-modulated (AM) 315 MHz RF carrier, followed by an ultra-low power low-frequency (LF) amplifier for the demodulated signal, and a commercial ultra-low-power wake-up receiver IC. Special emphasis has been put into optimizing the RF part with respect to its input sensitivity and selectivity. With two different versions of this circuit part, RF reception sensitivity could be raised from -52 dBm to -63 dBm. Power consumption is 7.4 µW at a minimum supply voltage of 2 V.
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