28.1 A 0.42nW 434MHz -79.1dBm Wake-Up Receiver with a Time-Domain Integrator

PicoNodes have applications in warehouse inventory, smart homes, or integrated patient monitoring and require ultra-low power consumption to eliminate battery replacement or enable batteryless systems. A small form factor is key for ubiquitous deployment. Recently, wake-up receivers [1, 2]have traded off latency for improved sensitivity for non-latency-critical applications. However, the improved sensitivity requires a high-Q front-end inductor that limits operation to below 200MHz; this stands in the way of a small antenna form factor. Higher-frequency operation makes a smaller antenna possible, but entails lower-Q inductors and higher package parasitics. A receiver with a gate-biased self-mixer [3]has demonstrated a moderate sensitivity at 550MHz with a relatively low-Q matching network, however, the self-mixer introduces extra input capacitance.