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"With the accurate thermistor models, our customers can develop systems that focus on controlling the critical junction temperatures of electronic devices, not just the secondary 'case' or 'local ambient' temperatures." Mike Donnelly Principal Engineer, Siemens The Role of Electrical and Thermal Modeling in Sensor Integration To help ease the selection of and design process with sensors, it is invaluable to have high-quality electrical and thermal models at your disposal. Before an engineer can place anything on a printed circuit board (PCB), it is of the utmost importance to simulate the design. An electrical simulation allows engineers to perform the necessary circuit analysis to understand the electrical operation of the sensor within their circuit and their system as a whole, while a thermal simulation allows a designer to predict the thermal behavior of a given sensor at different operating points, environmental conditions, and use cases. In general, these kinds of simulations are often performed in software like SPICE or ANSYS or in multidisciplinary languages like VHDL-AMS, all of which are industry standards. In order to have accurate and reliable simulations, engineers must first have accurate and reliable electrical and thermal models of their sensors. A good model will accurately reproduce the real-world electrical and thermal behavior of a device. An electrical model will include key electrical specifications of the sensor such as power draw, output power, sensitivity, linearity, and tolerances. Thermal models will include properties such as temperature drift, temperature coefficients, thermal resistance, and changes of resistance with temperature. Chapter Two 9 | The Role of Electrical and Thermal Modeling in Sensor Integration