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In the circuit shown below, the op-amp is ideal, the transistor has VBE = 0.6 V and β = 150. Decide whether the feedback in the circuit is positive or negative and determine the voltage V at the output of op-amp.
  • a)
    Positive feedback, V = 10V
  • b)
    Positive feedback, V = 0V
  • c)
    Negative feedback, V = 5 V
  • d)
    Negative feedback, V = 2 V
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Inthe circuit shown below, the op-amp is ideal, the transistor has VBE...
Voltage at inverting terminal VB = 5 V. Ideal op-amp has infinite input resistance so there will be no current pass through the op-amp. So VA and VB will be virtual grounded, VA = VB =5V.

Since, VC = VA = 5 V

Here given p is very large, so IC  IE = 1 mA
V' = 1.4 x 103 x 1 x 10-3  = 1.4 V
Therefore, output voltage V = V' + VBE =1.4 + 0.6 = 2V
There is no need to check positive or negative feedback because 2V is available only in option (d).
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Inthe circuit shown below, the op-amp is ideal, the transistor has VBE = 0.6 V and β= 150. Decide whether the feedback in the circuit is positive or negative and determine the voltage V at the output of op-amp.a)Positive feedback,V = 10Vb)Positive feedback,V = 0Vc)Negative feedback,V = 5 Vd)Negative feedback,V = 2 VCorrect answer is option 'D'. Can you explain this answer?
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