Differential amplifiers are often used in conjunction with a Wheatstone bridge, such as that shown in Figure P8.10, where each resistor is a temperature sensing element, and their change in resistance ?R is directly proportional to their change in temperature ?T . The constant of proportionality is the temperature coefficient ±?, which can be positive (PTC) or negative (NTC). Find the Thévenin equivalent network seen by the amplifier to the left of nodes a and b. Assume that ?R = ±?T and |?R| ? R0.
Analysis:
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What is a prototype?
What will be an ideal response?
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