Find an expression for the gain of the circuit of Figure P8.23.
8.21 Differential amplifiers are often used in conjunction with the Wheatstone bridge. Consider the bridge shown in Figure P8.21, where each resistor is a temperature-sensing element and the change in resistance is directly proportional to a change in
3 Ù 2 Ù
temperature—that is, �R = α (±�T), where the sign
is determined by the positive or negative temperature
coefficient of the resistive element.
a. Find the Thévenin equivalent that the amplifier sees
1/6 F _
at point a and point b. Assume that |�R|
b. If |�R| = K�T , with K a numerical constant, find an expression for vout (�T), that is vout as a function of change in temperature.
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