Question

In Figure 3 shown, V1 = 100 millivolts. Further, R1 = 1Kohm, R2 = 10 Kohm, R3 = 5 Kohm, R4= 5 Kohm, R5 = 10 Kohm and RL = 1Kohm.

(i) Determine the amplified output voltage V2 of the op-amp (of open-loop gain A) in circuit shown in Figure 3.

(ii) Suppose this amplified voltage V2 becomes the source voltage to a passive circuit as illustrated in Figure.3. Find Thevenin’s equivalent circuit looking at the terminal XY. Hence, determine the voltage VRL and the power dissipated in the load, RL.

[Solution hints: 1. Gain of a non-inverting amplifier = [1 + R2/R1]2. Thevenin theorem parameters: VTh corresponds to open-circuit voltage at X-Y; and, RThrefers to input resistance deduced at X-Y with voltage-source short-circuited]

FIGURE 3 volt volt Vel

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Answer #1

0.1V IK V5 Vo 5K 10K um By Virtual ground concept 5K EIK VRIL jok (o- o. 1) = 0.1-vo 10 - 1 = 0.1-vo Vo=114 (11) Accordurig ttherinin equivalent Rsn=3.4375K V0-7566 for SK M w WRL liv Vx= lex (5/11) (51110 +5 Va=0.448V By Voltage divider VRL= 1 x x =

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