Date of Graduation

12-2018

Document Type

Thesis

Degree Name

Master of Science in Electrical Engineering (MSEE)

Degree Level

Graduate

Department

Electrical Engineering

Advisor

H. Alan Mantooth

Committee Member

Jia Di

Second Committee Member

A. Matthew Francis

Keywords

High Temperature Electronics, RS-485, Silicon Carbide, Transceiver, Wide Bandgap ICs

Abstract

This thesis presents the design, simulation and test results of a silicon carbide (SiC) RS-485 transceiver for high temperature applications. This circuit is a building block in the design and fabrication of a digital data processing and control system. Automation processes for extreme environments, remote connection to high temperature locations, deep earth drilling, and high temperature data acquisition are some of the potential applications for such a system. The transceiver was designed and developed in a 1.2 µm SiC-CMOS process by Raytheon Systems, Ltd. (UK). It has been tested with a supply voltage of 12 V and 15 V, temperatures from 25°C to 400°C, half-duplex and full-duplex configurations, and with 2400 ft of category 5e (cat5e) cable. At 400°C, the rise and fall times are 32 ns and 24 ns respectively. The transceiver has been tested with a silicon RS-485 transceiver over temperature in order to characterize the device performance when acquiring data from a hot environment and transmitting it to a cooler environment and vice versa. Finally, high temperature performance over time is demonstrated over 150 hours at 300°C.

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