An npn transistor has the CE input characteristics shown in Figure 3-19 (p. 115) and the CE output characteristics shown in Figure 3-20 (p. 115). (a) Find IB when VBE = 0.7 V and VCE = 20 V.

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An npn transistor has the CE input characteristics shown in Figure 3-19 (p. 115) and the CE output characteristics shown in Figure 3-20 (p. 115).

(a) Find IB when VBE = 0.7 V and VCE = 20 V.

(b) Find the beta of the transistor at VCE = 6.0 V and IB = 20uA (neglecting leakage).

(c) Find bac for VCE = 6.0V and IB varying from 20 uA to 40 uA.

(d) What is the approximate value of VCE,sat in Fig. 3-20?

70 uA
10MA
60 uA
50 uA
Ic
40 uA
IB
5mA
30 uA
20 uA
10 uA
0 uA
OA
ov
2V
4V
6V
8V
VCE
FIGURE 3-20 Common-emitter output characteristics
Transcribed Image Text:70 uA 10MA 60 uA 50 uA Ic 40 uA IB 5mA 30 uA 20 uA 10 uA 0 uA OA ov 2V 4V 6V 8V VCE FIGURE 3-20 Common-emitter output characteristics
FIGURE 3-19
Common-emitter
Ig QUA)
input characteristics
OV
20ν
80
60
40
20
VBE
(volts)
0,1 0,2 0,3 04 0.5 0,6 0,7 0.8
Transcribed Image Text:FIGURE 3-19 Common-emitter Ig QUA) input characteristics OV 20ν 80 60 40 20 VBE (volts) 0,1 0,2 0,3 04 0.5 0,6 0,7 0.8
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