Homework5

# Homework5 - Homework 5 1 For the basic transistor circuit...

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Homework 5 1. For the basic transistor circuit below, solve for the Q-point (all three currents and voltages on the transistor) assuming a β =100, an Early voltage, V A =100V, a V turn on =0.7 V for any forward biased Base-emitter junction and a V turn on =0.3 V for any forward biased base-collector junction (different due to lower doping in CB junction): a. Assuming the transistor is biased in cutoff (neglect leakage currents). b. Assuming the transistor is biased in saturation. c. Assuming the transistor is biased in forward active. d. Which assumption is valid? e. What value of Is would result in 0.7 V for the base emitter voltage? f. Determine the voltage gain VoutAC/VinAC. g. Plot VoutDC and VoutAC for a 1 kHZ, 1mV VinAC signal. h. Note: While I am not asking for it herein, you should be able to determine, β, α , and I S from the fundamental material parameters.

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2. For the circuit below, assume that the transistor is biased in forward active mode and β =255.9 and I S =14.3fA.
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Homework5 - Homework 5 1 For the basic transistor circuit...

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