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292 Electronic Devices
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diode (p 784) depletion layer (p 784) transistor (p 787) microchip (p 788)
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A pn-junction diode consists of a layer of a p-type semiconductor joined with a layer of an n-type semiconductor Diodes conduct charges in one direction only They can be used in rectifier circuits to convert AC to DC Electrons and holes near either side of the diode junction combine to produce a region without charge carriers known as the depletion layer Applying a potential difference of the proper polarity across the diode makes the depletion layer even wider, no current is observed, and the diode is said to be reverse-biased Reversing the polarity of the applied potential across the diode greatly reduces the depletion layer, current is observed, and the diode is said to be forward-biased A transistor is a sandwich of three layers of semiconductor material, configured as either npn- or pnp-layers The center base layer is very thin compared to the other layers, the emitter and collector A transistor can act as an amplifier to convert a weak signal into a much stronger one The ratio of the collector-emitter current to the base current is known as the current gain and is a useful measure of transistor amplification Conductivity of semiconductors increases with increasing temperature or illumination, making them useful as thermometers or light meters Diodes that emit light when a potential is applied are used in optical devices
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33 Complete the concept map using the following
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terms: transistor, silicon diode, emits light, conducts both ways
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41 For the energy-band diagrams shown in Figure 29-16,
which have half-full conduction bands
42 For the energy-band diagrams shown in Figure 29-16,
which ones represent semiconductors
43 The resistance of graphite decreases as temperature
rises Does graphite conduct electricity more like copper or more like silicon does
copper wire
44 Which of the following materials would make a
better insulator: one with a forbidden gap 8-eV wide, one with a forbidden gap 3-eV wide, or one with no forbidden gap
amplifies
conducts one way
45 Consider atoms of the three materials in problem
44 From which material would it be most difficult to remove an electron
Mastering Concepts
34 How do the energy levels in a crystal of an element
differ from the energy levels in a single atom of that element (291)
46 State whether the bulb in each of the circuits of
Figure 29-17 (a, b, and c) is lighted
35 Why does heating a semiconductor increase
its conductivity (291)
36 What is the main current carrier in a p-type
semiconductor (291)
37 An ohmmeter is an instrument that places a
potential difference across a device to be tested, measures the current, and displays the resistance of the device If you connect an ohmmeter across a diode, will the current you measure depend on which end of the diode was connected to the positive terminal of the ohmmeter Explain (292)
Figure 29-17
47 In the circuit shown in Figure 29-18, state whether
lamp L1, lamp L2, both, or neither is lighted
38 What is the significance of the arrowhead at the
emitter in a transistor circuit symbol (292)
L1 L2
39 Describe the structure of a forward-biased diode,
and explain how it works (292)
Figure 29-18
Applying Concepts
40 For the energy-band diagrams shown in Figure 29-16,
which one represents a material with an extremely high resistance
48 Use the periodic table to determine which of the
following elements could be added to germanium to make a p-type semiconductor: B, C, N, P, Si, Al, Ge, Ga, As, In, Sn, or Sb
49 Does an ohmmeter show a higher resistance when a
pn-junction diode is forward-biased or reverse-biased
50 If the ohmmeter in problem 49 shows the lower
resistance, is the ohmmeter lead on the arrow side of the diode at a higher or lower potential than the lead connected to the other side
51 If you dope pure germanium with gallium alone,
do you produce a resistor, a diode, or a transistor
Figure 29-16
29 Solid-State Electronics
For more problems, go to Additional Problems, Appendix B
52 Draw the time-versus-amplitude waveform for point
A in Figure 29-19a assuming an input AC waveform, as shown in Figure 29-19b
57 Diode A silicon diode with I/V characteristics, as
shown in Figure 29-10, is connected to a battery through a 270- resistor The battery forward-biases the diode, and the diode current is 15 mA What is the battery voltage
58 Assume that the switch shown in Figure 29-21 is off
a Determine the base current b Determine the collector current c Determine the voltmeter reading
A Time 1500 15 V 120,000 A V 35 V
AC voltage
Figure 29-19
Mastering Problems
291 Conduction in Solids
53 How many free electrons exist in a cubic centimeter
of sodium Its density is 0971 g/cm3, its atomic mass is 2299 g/mol, and there is 1 free electron per atom
Figure 29-21
59 Assume that the switch shown in Figure 29-21 is
on, and that there is a 070-V drop across the baseemitter junction and a current gain from base to collector of 220 a Determine the base current b Determine the collector current c Determine the voltmeter reading
54 At a temperature of 0 C, thermal energy frees
155 109 e /cm3 in pure silicon The density of silicon is 233 g/cm3, and the atomic mass of silicon is 2809 g/mol What is the fraction of atoms that have free electrons
292 Electronic Devices
55 LED The potential drop across a glowing LED is
about 12 V In Figure 29-20, the potential drop across the resistor is the difference between the battery voltage and the LED s potential drop What is the current through each of the following a the LED b the resistor
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