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 temperature that is, AR = a (+AT), 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 at point a and point b. Assume that |AR? « R. b. If JAR| = KAT, with K a numerical constant, find an expression for vout (AT), that is vaut as a function of change in temperature. 100 ka R- JAR Rot JAR| ww 10 V R+|A| Vout 100 ka R =1 ka
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 temperature that is, AR = a (+AT), 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 at point a and point b. Assume that |AR? « R. b. If JAR| = KAT, with K a numerical constant, find an expression for vout (AT), that is vaut as a function of change in temperature. 100 ka R- JAR Rot JAR| ww 10 V R+|A| Vout 100 ka R =1 ka
Introductory Circuit Analysis (13th Edition)
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Author:Robert L. Boylestad
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Transcribed Image Text: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
temperature that is, AR = a (+AT), 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
at point a and point b. Assume that |AR? « R.
b. If JAR| = KAT, with K a numerical constant, find
an expression for vout (AT), that is vaut as a
function of change in temperature.
100 ka
R- JAR
Rot JAR|
ww
10 V
R+|A|
Vout
100 ka
R =1 ka
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