A Low Power Asynchronous GPS Baseband Processor

Benjamin Tang, Stephen Longfield, Rajit Manohar, and Sunil Bhave

We present the design and implementation of an asynchronous Global Positioning System (GPS) baseband 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 baseband processors.