Consider the transistor circuit below. Let p-50 and VA-40 a. (10 pts) Determine

Question

Consider the transistor circuit below. Let p-50 and VA-40 a. (10 pts) Determine the value of RB nceded to set the emiter current to 2 mA 1· RC Q1 NPN RE 1K Answer b. (8 pts) Determine the voltage between the emitter and collector, V Ignore Va effects Answer c 8 pts) For the conditions in part (o), is the transistor in the saturation mode? Justify your answer. d (8 pts) Determine the resistance between collector and emitter, fo due to VA (3 pts) True or False. The transistor's QPoint for this type ofbas circuit is very sensitive to changes. e.

Explanation / Answer

Answer:-a) By using kvl we can write for emitter to base part as-

0 - ((0.002/51)*RB) -0.7 - (0.002*1000) + 12 = 0

=> RB = 237.15 kOhm

b)Current Ic = 2*50/51 mA = 1.96 mA. So Vc = 0 - Ic*Rc = -5.88 V.

similarly VE - IE*RE + 12 = 0, VE = -10 V. Hence VcE = Vc - VE = 4.12 V.

c) For the BJT in saturation VCE = 0, but here this condition is not verified. So transistor is not in saturation mode.

d) Output resistance = VA/Ic = 40/1.96 kohm = 20.41 kOhm.

e) False. In this type of biasing Q-point is stable.

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