# AboutExercise 4.5.1RfwwаR2R4bIn the circuit of the figure above, a bridge circuit is connected at the input side of an invertingop-amp circuit.(a)Obtain the Thevenin equivalent at terminals (a, b) for the bridge circuit.(b)Use the result in (a) to obtain an expression for G = vo/Us(c)Evaluate G for R1101, and Rf = 100kN100, R2 R3R4Feedback?

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55 views help_outlineImage TranscriptioncloseAbout Exercise 4.5.1 Rf ww а R2 R4 b In the circuit of the figure above, a bridge circuit is connected at the input side of an inverting op-amp circuit. (a) Obtain the Thevenin equivalent at terminals (a, b) for the bridge circuit. (b) Use the result in (a) to obtain an expression for G = vo/Us (c) Evaluate G for R1 101, and Rf = 100kN 100, R2 R3 R4 Feedback? fullscreen
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Step 1

(a)

Consider that the current flowing through the upper loop is i1 and the current through the lower loop is i2. Voltage between terminals a and b is the Thevenin voltage Vth. The circuit to find the Thevenin equivalent between the given terminals can be drawn as below:

Step 2

The terminal b is grounded, therefore, Vb = 0V.

The current through the open circuit is zero, thus, the values of current i1 and i2 will be:

Step 3

From the circuit, the Theve... help_outlineImage TranscriptioncloseV = V =V =V th ab As, V OV Applying Kirchhoff s voltage law in the loop 'a123b' as shown in figure: --R,R 0 Vs VE |R, + |R. R R R R fullscreen

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