ch_06_probs - CHAPTER Modeling Bipolar Transistors 6 119...

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119 CHAPTER 6 Modeling Bipolar Transistors
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120 Chapter 6: Modeling Bipolar Transistors CHAPTER 6: PROBLEMS 6.1 The following questions ask you to determine the correct PWL region for a transistor at each of the following operating points. You may assume that the transistor is an NPN BJT with a piecewise linear model having the following constants: V BE-ON = 0.7V, V CE-SAT = 0.2V, β = 100. (a) V BE = –0.7V V CE = 0 V I B = 0μA I C =0 mA. (b) I B = +100μA I C = 10mA V BE = +0.7V V CE = 2V. (c) I B = +100μA I C = 1mA V BE = +0.7V V CE = +0.2V. 6.2 The following questions ask you to determine the power dissi- pated in the transistor for each of the following operating points. You may assume that the transistor is an NPN BJT with a piecewise linear model having the following constants: V BE-ON = 0.7V, V CE-SAT = 0.2V, β = 100. For each of the following operating points compute the total power dissipation in the transistor. HINT: the total power dissi- pation in the transistor is the sum of the power dissipation in the base-emitter loop and the collect-emitter loop. That is Power Dissipated = V BE I B + V CE I C (a) V BE = –0.7V V CE = 0 V I B = 0μA I C =0 mA. (b) I B = +100μA I C = 10mA V BE = +0.7V V CE = 2V. (c) I B = +100μA I C = 1mA V BE = +0.7V V CE = +0.2V. 6.3 The following questions relate to the transistor circuit shown in Fig. P6.1. Note, we have intentionally omitted the value of β for this transistor as there is sufficient information in the prob- lem to allow its solution without providing β . (a) What are the values of V BC , V BE , and V CE ? (b) What is the value of the base current, I B ? (c) In what region of operation is the transistor? (d) What is the value of β for this transistor?
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121 Analog Electronics 6.4 The following questions relate to the transistor circuit shown in Fig. P6.2.
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