ch_09_probs

# ch_09_probs - 205 205 CHAPTER 9 Binary Logic Circuits 206...

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Unformatted text preview: 205 205 CHAPTER 9 Binary Logic Circuits 206 Chapter 9: Binary Logic Circuits PROBLEMS 9.1 Consider the circuit shown below. For the transistor, assume that β = 100, V BE–ON = 0.7V and V CE–SAT = 0.2V. Let logic 1 be 5.0V and logic 0 be 0.2V. Fill in a truth table for V o vs. V 1 and V 2 using the actual voltage values. What type of logic gate does this circuit represent. Assume a threshold voltage of 2.5v. 9.2 Consider the circuit shown below. For the transistor, assume that β = 100, V BE–ON = 0.7V and V CE–SAT = 0.2V. Let logic 1 be 5.0V and logic 0 be 0.2V. Fill in a truth table for V o vs. V 1 V 2 V 1 1 k Ω 1 k Ω 1 k Ω V o V CC = 5V 207 207 Digital Electronics and V 2 using the actual voltage values. What type of logic gate does this circuit represent. Assume a threshold voltage of 2.5v. 9.3 For the circuit shown below, use V D–ON = 0.7V. For a logic “1” input use 5v. For a logic “0” input use 0v. A logic “1” out- put is obtained if the voltage is greater than 3v. A logic “0” output is obtained if the voltage is lower than 2v. Determine the logic function of the circuit shown below. Show a truth table which includes input and output voltages and be sure to justify your results. 9.4 For the circuit shown below, use V D–ON = 0.7V. For a logic “1” input use 5v. For a logic “0” input use 0v. A logic “1” out- put is obtained if the voltage is greater than 3v. A logic “0” output is obtained if the voltage is lower than 2v. Determine V 1 1 k Ω 1 k Ω V o V 2 1 k Ω V CC = 5V 100 Ω V 1 V 2 V o 208 Chapter 9: Binary Logic Circuits the logical (Boolean) function, F, of the circuit shown below in terms of input A, B, C and D. Now change the values of the upper resistors to 100k Ω , how does this effect F? 9.5 For the transistor in the circuit shown below, assume that β = 100, V BE–ON = 0.7V and V CE–SAT = 0.2V. For a logic “1” input use 5v. For a logic “0” input use 0v. A logic “1” output is obtained if the voltage is greater than 3v. A logic “0” output is obtained if the voltage is lower than 2v. Determine the logic 100 Ω A B F +5v 100 Ω +5v C D 10 k Ω 209...
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ch_09_probs - 205 205 CHAPTER 9 Binary Logic Circuits 206...

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