Bipolar Junction Transistors (BJTs)
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1 C H A P T E R 6 Bipolar Junction Transistors (BJTs)
2 Figure 6.1 A simplified structure of the npn transistor and pnp transistor.
3 Table 6.1: BJT modes of Operation Mode Cutoff Active Saturation EBJ Reverse Forward Forward CBJ Reverse Forward Forward
4 Operation of the npn Transistor in the Active Mode Figure 6.3 Current flow in an npn transistor biased to operate in the active mode. (Reverse current components due to drift of thermally generated minority Sedra/Smith carriers are Copyright not shown.) 2010 by Oxford University Press, Inc.
5 i C = I S e v BE / V T i = B i B i β I S = ( β i i C E C = = ) e i v BE / V T + C αi E i β α = β +1 α β = 1 α B Figure 6.5 Large-signal equivalent-circuit models of the npn BJT operating in the forward active mode. β= common-emitter current gain
6 Example 6.1.
7 Operation in the Saturation Mode β forced = i i C B saturation V V CEsat CEsat = V BE 0.1 V BC to 0.3V
8 Model npn BJT Operation in the Saturation Mode Figure 6.9 Modeling the operation of an npn transistor in saturation by augmenting the model of Fig. 6.5(c) with a forward conducting diode D C. Note that the current through D C increases i B and reduces i C.
9 Figure 6.10 Current flow in a pnp transistor biased to operate in the active mode.
10 Figure 6.11 Two large-signal models for the pnp transistor operating in the active mode.
11 BJT Current-Voltage Characteristics Figure 6.12 Circuit symbols for BJTs. Figure 6.13 Voltage polarities and current flow Sedra/Smith in transistors Copyright biased 2010 by Oxford in the University active Press, Inc. mode.
12 BJT Current-Voltage Characteristics Table 6.2: Summary of the BJT Current-Voltage Relationship in the Active Mode
13 Example 6.2.
14 E6.13, V E =-0.7V, β=50, find all currents and V C E6.14, V B =1.0V, V E =1.7V, β=?, find all currents and V C
15 Graphical Representation of Transistor Characteristics Effect of temperature on the i C -v BE, at a constant emitter current, v BE changes by -2mV/ 0 C
16
17 i C = I S e v BE / VT (1 + v V CE A ) r r I 0 0 ' C = = V V I' = I A A C S + V I e C CE V BE / V T Figure 6.18 Large-signal equivalent-circuit models of an npn BJT operating in the active mode in the common-emitter configuration with the output resistance r o included.
18 An alternative form of the Common-Emitter Characteristics Figure 6.19 Common-emitter characteristics. (a) Basic CE circuit; note that in (b) the horizontal scale is expanded around the origin to show the saturation region in some detail. A much greater expansion of the saturation region is shown in (c).
19 An Alternative form of the Common-Emitter Characteristics Figure 6.20 A simplified equivalent-circuit model of the saturated transistor.
20 Example 6.3.
21 BJT Circuits at DC Cutoff: EBJ: reversed bias, CBJ: reversed bias NPN Table 6.3 Conditions and Models for the Operation of the BJT in Various Modes (continued) PNP
22 Table 6.3 (continued) Active: EBJ: forward bias, CBJ: reversed bias NPN PNP Saturation: EBJ: forward bias, CBJ: forward bias NPN PNP
23 Example 6.4 Figure 6.22 Analysis of the circuit for Example 6.4: (a) circuit; (b) circuit redrawn to remind the reader of the convention used in this book to show connections to the power supply; (c) analysis with the steps numbered.
24 Example 6.5 Figure 6.23 Analysis of the circuit for Example 6.5. Note that the circled numbers indicate the order of the analysis steps.
25 Example 6.6 Figure 6.24 Example 6.6: (a) circuit; (b) analysis, with the order of the analysis steps indicated by circled numbers.
26 Example 6.7 Figure 6.25 Example 6.7: (a) circuit; (b) analysis, with the steps indicated by circled numbers.
27 Example 6.8 Figure 6.26 Example 6.8: (a) circuit; (b) analysis, with the steps indicated by the circled numbers.
28 Example 6.9 Figure 6.27 Example 6.9: (a) circuit; (b) analysis with steps numbered.
29 Example 6.11 Figure 6.29 Circuits for Example 6.11.
30 Figure 6.30 Example 6.12: (a) circuit; (b) analysis with the steps numbered.
C H A P T E R 6 Bipolar Junction Transistors (BJTs)
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