1. Calculate the voltage across the 91 k resistor.
2. Calculate the value of VCEQ.
3. Calculate the approximate value of the maximum power rating for the transistor represented by the output characteristics of Figure 4.1?
4. For what value of does the transistor enter the saturation region?
5. Determine the change in IC from 25ºC to 175ºC for the transistor defined in this table for fixed-bias with RB = 240 k and = 100 due to the S(VBE) stability factor.
6. Which of the following is (are) related to an emitter-follower configuration?
7. At what region of operation is the base-emitter junction forward biased and the base-collector junction reverse biased?
8. You can select the values for the emitter and collector resistors from the information that is provided for this circuit.
9. In the case of this circuit, you must assume that VE = 0.1·VCC in order to calculate RC and RE.
10. For an "on" transistor, the voltage VBE should be in the neighborhood of 0.7 V.
11. In a voltage-divider circuit, which one of the stability factors has the least effect on the device at very high temperature?
12. Which of the following is (are) a stability factor?
13. Calculate ICsat.
14. Calculate the storage time in a transistor switching network if toff is 56 ns, tf = 14 ns, and tr = 20 ns.
15. Determine ICQ at a temperature of 175º C if ICQ = 2 mA at 25º C for RB / RE = 20 due to the S() stability factor.
16. Calculate ETh for this network.
17. Which of the following currents is nearly equal to each other?
18. Which of the following voltages must have a negative level (value) in any npn bias circuit?
19. Determine the values of VCB and IB for this circuit.
20. Use this table to determine the change in IC from 25ºC to 175ºC for RB / RE = 250 due to the S(ICO) stability factor. Assume an emitter-bias configuration.
21. For the typical transistor amplifier in the active region, VCE is usually about ________ % to ________ % of VCC.
22. For the BJT to operate in the saturation region, the base-emitter junction must be ________-biased and the base-collector junction must be ________-biased.
23. The total time required for the transistor to switch from the "off" to the "on" state is designated as ton and defined as the delay time plus the time element.
24. Calculate Rsat if VCE = 0.3 V.
25. The ratio of which two currents is represented by ?