GATE EC 2016 Set 3 — Question 24
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Analog Circuits → BJT & MOSFET Amplifiers → Biasing & DC Operating Point
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Question
Consider the circuit shown in the figure. Assuming volt, the value of the dc voltage (in volt) is __________
Correct answer
0.45 to 0.55
Solution
From the circuit, . Thus, . Since the emitter of Q1 is connected to the base of Q2, . The emitter of Q2 is at , so , which is consistent with the given value. The current through the resistor is . The collector current is given by . For the output voltage to be across the resistor, must be . This implies . The total emitter current of Q1 is . This set of currents and voltages is self-consistent for the given circuit configuration. Thus, .
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