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19. Analyze the circuit in Figure S-39 to determine the correct voltages at the transistor terminals with respect to ground. Assume Bpc 100.

19. Analyze the circuit in Figure S-39 to determine the correct voltages at the transistor terminals with respect to ground. Assume Bpc 100.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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Section 5-3 Other Bias Methods 19. Analyze the circuit in Figure -39 to determine the correct voltages at the transistor terminals with respect to ground. Assume Bọc - 100. +5V 20. To what value can Re in Figure 5-39 be reduced without the transistor going into saturation? 21. Taking Vag into account in Figure 5-39. how much will Ig change with a temperature increase from 25 C to 100 C? The Va is 0.7 V at 25°C and decreases 2.5 mV per degree Celsius. Neglect any change in Boc R Re 22. When can the effect of a change in Bpc be neglected in the emitter bias circuit? R 23. Determine le and Veg in the pap emitter bias circuit of Figure 5-40. Assume Buc - 100. 10 kfl 24. Determine Va. Ve and le in Figure 5-41. 22 k -SV V +10v +10 V AFIGURE S-39 470 10 33 kn Rc 330 0 Poc 90 -10 V Vee A FIGURE S-40 A FIGURE S-41 25. What value of Re can be used to decrease le in Problem 24 by 25 percent? 26. What is the minimum power rating for the transistor in Problem 25? 27. A collector-feedback circuit uses an npn transistor with Vee = 12 V.Rc = 12 kn, and Ry = 47 kl. Determine the collector current and the collector voltage if Boc = 200. 28. Determine Ig, lo and Vce for a base-biased transistor circuit with the following values: Boc = 90, Vec= 12 V. R = 22 kfn, and Re = 100 n. 29. If Boc in Problem 28 doubles over temperature, what are the Q-point values? Vee 19 V Re 100 0 30. You have two base bias circuits connected for testing. They are identical except that one is biased with a separate Vua source and the other is biased with the base resistor connected to Vee Ammeters are connected to measure collector current in each circuit. You vary the Vee supply voltage and observe that the collector current varies in one circuit, but not in the other. In which circuit does the collector current change? Explain your observation. R 15 kf 31. The datasheet for a particular transistor specifies a minimum Boc of 50 and a maximum Boc of 125. What range of Q-point values can be expected if an attempt is made to mass-produce the circuit in Figure 5-42? Is this range acceptable if the Q-point must remain in the transis- tor's linear region? A FIGURE 5-42 32. The base bias circuit in Figure 5-42 is subjected to a temperature variation from 0°C to 70°C. The Bpc decreases by 30 percent at OC and increases by 75 percent at 7oC from its nominal value of I10 at 25°C. What are the changes in lc and VCE over the temperature range of O'C to 70°C?
Transcribed Image Text:Section 5-3 Other Bias Methods 19. Analyze the circuit in Figure -39 to determine the correct voltages at the transistor terminals with respect to ground. Assume Bọc - 100. +5V 20. To what value can Re in Figure 5-39 be reduced without the transistor going into saturation? 21. Taking Vag into account in Figure 5-39. how much will Ig change with a temperature increase from 25 C to 100 C? The Va is 0.7 V at 25°C and decreases 2.5 mV per degree Celsius. Neglect any change in Boc R Re 22. When can the effect of a change in Bpc be neglected in the emitter bias circuit? R 23. Determine le and Veg in the pap emitter bias circuit of Figure 5-40. Assume Buc - 100. 10 kfl 24. Determine Va. Ve and le in Figure 5-41. 22 k -SV V +10v +10 V AFIGURE S-39 470 10 33 kn Rc 330 0 Poc 90 -10 V Vee A FIGURE S-40 A FIGURE S-41 25. What value of Re can be used to decrease le in Problem 24 by 25 percent? 26. What is the minimum power rating for the transistor in Problem 25? 27. A collector-feedback circuit uses an npn transistor with Vee = 12 V.Rc = 12 kn, and Ry = 47 kl. Determine the collector current and the collector voltage if Boc = 200. 28. Determine Ig, lo and Vce for a base-biased transistor circuit with the following values: Boc = 90, Vec= 12 V. R = 22 kfn, and Re = 100 n. 29. If Boc in Problem 28 doubles over temperature, what are the Q-point values? Vee 19 V Re 100 0 30. You have two base bias circuits connected for testing. They are identical except that one is biased with a separate Vua source and the other is biased with the base resistor connected to Vee Ammeters are connected to measure collector current in each circuit. You vary the Vee supply voltage and observe that the collector current varies in one circuit, but not in the other. In which circuit does the collector current change? Explain your observation. R 15 kf 31. The datasheet for a particular transistor specifies a minimum Boc of 50 and a maximum Boc of 125. What range of Q-point values can be expected if an attempt is made to mass-produce the circuit in Figure 5-42? Is this range acceptable if the Q-point must remain in the transis- tor's linear region? A FIGURE 5-42 32. The base bias circuit in Figure 5-42 is subjected to a temperature variation from 0°C to 70°C. The Bpc decreases by 30 percent at OC and increases by 75 percent at 7oC from its nominal value of I10 at 25°C. What are the changes in lc and VCE over the temperature range of O'C to 70°C?
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