# 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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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...

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