ch_06_probs - 119 119 CHAPTER 6 Modeling Bipolar...

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Unformatted text preview: 119 119 CHAPTER 6 Modeling Bipolar Transistors 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, = 100. (a) V BE = 0.7V V CE = 0 V I B = 0A I C =0 mA. (b) I B = +100A I C = 10mA V BE = +0.7V V CE = 2V. (c) I B = +100A 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, = 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 = 0A I C =0 mA. (b) I B = +100A I C = 10mA V BE = +0.7V V CE = 2V. (c) I B = +100A 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 for this transistor as there is sufficient information in the prob- lem to allow its solution without providing . (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 for this transistor? 121 121 Analog Electronics 6.4 The following questions relate to the transistor circuit shown in Fig. P6.2....
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ch_06_probs - 119 119 CHAPTER 6 Modeling Bipolar...

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