Explain briefly about AC Bias Operation with DC Load line analysis.

Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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Explain briefly about AC Bias Operation with DC Load line analysis. 

2.4.2 AC Bias operation
When an input ac signal is applied to the amplifier of Fig. 2.5 , the output will vary from its DC bias
operating voltage and current. A small input signal, as shown in Fig. 2.5 , will cause the base current
to vary above and below the DC bias point, which will then cause the output collector current to
vary from the DC bias point set as well as the collector-emitter voltage to vary around its DC bias
57
value. As the input signal is increased, the output will vary further around the established DC bias
point until either the current (or voltage) reaches a limiting condition. For the current this limiting
condition is either zero current at the low end or Vcc > Rc at the high end of its swing. For the
collector-emitter voltage, the limit is either 0V or the supply voltage Vcc.
Input signal
- Input signal
Vcc
RC
Vcc
-Rc
Output
current swing
Output
current swing
VCE
Vcc
VCE
Output
voltage swing
Output
voltage swing
Fig. 2.7 Illustration of swings on the DC load line
ENGG_EEE_LECTURE NOTES_03Feb2022_V1.2
Page 58 of 117
Transcribed Image Text:2.4.2 AC Bias operation When an input ac signal is applied to the amplifier of Fig. 2.5 , the output will vary from its DC bias operating voltage and current. A small input signal, as shown in Fig. 2.5 , will cause the base current to vary above and below the DC bias point, which will then cause the output collector current to vary from the DC bias point set as well as the collector-emitter voltage to vary around its DC bias 57 value. As the input signal is increased, the output will vary further around the established DC bias point until either the current (or voltage) reaches a limiting condition. For the current this limiting condition is either zero current at the low end or Vcc > Rc at the high end of its swing. For the collector-emitter voltage, the limit is either 0V or the supply voltage Vcc. Input signal - Input signal Vcc RC Vcc -Rc Output current swing Output current swing VCE Vcc VCE Output voltage swing Output voltage swing Fig. 2.7 Illustration of swings on the DC load line ENGG_EEE_LECTURE NOTES_03Feb2022_V1.2 Page 58 of 117
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