A Low Power Asynchronous GPS Baseband Processor

We present the design and implementation of an asynchronous Global Positioning System (GPS) base band processor architecture designed with a combination of Quasi-Delay-Insensitive (QDI) and bundled-data techniques, with a focus on minimizing power consumption. All subsystems run at their natural frequency without clocking and all signal processing is done on-the-fly. Transistor-level simulations show that our system consumes only 1.4mW with position 3-D rms error below 4 meters, comparing favorably to other contemporary GPS base band processors.