Cálculo de Ganho Comum

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Step of 4 9.069P Draw the following circuit diagram: Rc 5. i₂ Rc + Q₂ R R Figure 1 Step of 4 Calculate the expression for total emitter current, I The base emitter junction area of one transistor is twice the other. So, the emitter bias current will split between the two transistors according to their area ratio. Calculate the expression for Substitute for and for 2i, = R 3R Step of 4 Calculate the expression for Substitute for i, 3R 3R = Calculate the expression for differential output voltage, = (4-4) Substitute for i, and for 3R 3R = = 3R 3R = 3R Step of 4 Calculate the value of common-mode gain of the circuit, Acm Substitute 3R for Vod 3R = 3R Substitute 12 kΩ for and 500 for R 12 = 3(500 kΩ) = 4 500 = 0.008 V/V Thus, the value of common-mode gain of the circuit, is 0.008 V/V