Consider the following circuit, where the transistors are similar Si transistors. Given I1 = 2mA, I2 = 1μA, Vcc = 12 V, find R1 and R2.

R1 = 10kΩ, R2 = 6kΩ

R1 = 5.6kΩ, R2 = 20kΩ

R1 =18kΩ, R2 = any value

R1 = 18kΩ, R2 = 5.6kΩ

Consider the following circuit, where the transistors are similar Si transistors. Given I1 = 2mA, I2 = 1μA, Vcc = 12 V, find R1 and R2. Correct Answer R1 = 18kΩ, R2 = 5.6kΩ

R2 = (Vcc – VBE)/I1 = (12 – 0.7)/2m = 5.65 kΩ – Using KVL Also, I2*R1 = VT ln(I1/I2) = 0.026 * ln(2) Thus, R1 = 0.026*ln(2)/1μ = 18 kΩ.

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Feb 20, 2025

Analog Circuits
Transistor Bias Configuration

Consider the following circuit, where the transistors are similar Si transistors. Given I1 = 2mA, I2 = 1μA, Vcc = 12 V, find R1 and R2.

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