Partnering with C-4 Systems of General Dynamics in Needham, MA, this Worcester Polytechnic Institute Major Qualifying Project team explored the idea of designing a completely digital temperature sensor on field-programmable gate arrays. The goals of this MQP were (1) to find consistency between our research and results, and (2) to design a sensor capable of outputting a range of 0-70C, a resolution of 0.1C/count, and an error of +/-1C. Since propagation delay is dependent on temperature, we designed a ring oscillator out of logical inverters and counted the number of set clock periods to measure the length of the oscillator\u27s total delay. We implemented our design and determined its measuring capability to be 20-70C with an average resolution of ~0.13C/count and an error of +/-2.75C
