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GATE EC 2016 Set 2 — Question 24

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NAT+1 / -0MediumCurrent Mirror (BJT & MOS)Current Mirrors & Diff AmpsAnalog Circuits

Analog Circuits → Current Mirrors & Diff Amps → Current Mirror (BJT & MOS)

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Question

Resistor R1R_1 in the circuit below has been adjusted so that I1=1 mAI_1 = 1\text{ mA}. The bipolar transistors Q1Q_1 and Q2Q_2 are perfectly matched and have very high current gain, so their base currents are negligible. The supply voltage VccV_{cc} is 6 V6\text{ V}. The thermal voltage kT/qkT/q is 26 mV26\text{ mV}.
Widlar current source circuit diagram
The value of R2R_2 (in Ω\Omega) for which I2=100 μAI_2 = 100\text{ }\mu\text{A} is ________
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