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II Problem (16 points) Fig.3 shows a series voltage regulator with amplifying function, A is the ideal op-amp, answer the fol

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Answer #1

1.As the output voltage reduces, the voltage given to the R1, R2, R3 and Ground circuit is reduced which reduces the voltage given to the negative input terminal of the operational amplifier, since the input voltage at positive input terminal of operational amplifier is fixed as it is connected to fixed voltage source through a fixed resistance, as the voltage at negative input terminal decreases, the difference between the voltages at the two input terminals of op amp increases hence the output of op amp increases which increases base current to the transistor which increases the collector amd emitter current which increases the output voltage across the load resistance.

2.

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