EXAMPLE 4.26 Determine the de levels for the currents and voltages of the direct-coupled amplifier of Fig. 4.72. Note that it is a voltage-divider bias configuration followed by a common-collector configuration; one that is excellent in cases wherein the input imped- ance of the next stage is quite low. The common-collector amplifier is acting like a buffer between stages. DC BIASING-BJTS Vcc 14 V Rc. 6.8 k. R, 33 kN Q2 B2= 50 Cc R, O v, P= 100 200 N 1 µF RE1.2 kn R 1 kN + R2 210 kN CE RE, 22.2 kN Vs |20 μF FIG. 4.72 Direct-coupled amplifier.

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EXAMPLE 4.26 Determine the de levels for the currents and voltages of the direct-coupled
amplifier of Fig. 4.72. Note that it is a voltage-divider bias configuration followed by a
common-collector configuration; one that is excellent in cases wherein the input imped-
ance of the next stage is quite low. The common-collector amplifier is acting like a buffer
between stages.
04 DC BIASING-BJTS
Vcc
14 V
Rc2 6.8 kN
R1
33 k2
Q2
B2= 50
Cc
R,
C.
B = 100
200 0
I µF
RE, 1.2 kn
RLI kN
+
R2
10 k2
CEL
RE 2.2 kN
20 μF
FIG. 4.72
Direct-coupled amplifier.
Transcribed Image Text:EXAMPLE 4.26 Determine the de levels for the currents and voltages of the direct-coupled amplifier of Fig. 4.72. Note that it is a voltage-divider bias configuration followed by a common-collector configuration; one that is excellent in cases wherein the input imped- ance of the next stage is quite low. The common-collector amplifier is acting like a buffer between stages. 04 DC BIASING-BJTS Vcc 14 V Rc2 6.8 kN R1 33 k2 Q2 B2= 50 Cc R, C. B = 100 200 0 I µF RE, 1.2 kn RLI kN + R2 10 k2 CEL RE 2.2 kN 20 μF FIG. 4.72 Direct-coupled amplifier.
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