lecture 5: bjt amplifiersmct.asu.edu.eg/uploads/1/4/0/8/14081679/ece334_l5_bjt_amplifiers.pdf ·...
TRANSCRIPT
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ECE 335: Electronic Circuits
Lecture 5:
BJT Amplifiers
Faculty of EngineeringFaculty of EngineeringFaculty of EngineeringFaculty of Engineering
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Linear Analog Amplifier
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Basic Characteristics of an Amplifier
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Basic Characteristics of an Amplifier
(cont.)
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Basic BJT Amplifier
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Graphical Analysis of BJT Amplifiers
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Graphical Analysis of BJT Amplifiers
(Cont.)
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Analysis of BJT amplifiers
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DC Analysis and Equivalent Circuit
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AC Analysis and Equivalent Circuit
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Small-Signal Hybrid-π Equivalent Circuit
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Small-Signal Hybrid-π Equivalent Circuit
(Cont.)
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Small-Signal Voltage Gain
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Input and Output Resistances
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Example: DC Circuit Analysis
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Example: DC Circuit Analysis (Cont.)
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Example: DC Circuit Analysis (Cont.)
-
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Small-Signal Hybrid-π Equivalent
Circuit with Early Effect
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Example: Determine BJT Amplifier
Parameters
• Determine the small-signal voltage gain, input resistance,
and output resistance of the BJT amplifier circuit in
previous example with the early effect. Assume that the
early voltage is 50V.
19
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Common-Emitter Amplifiers (with Voltage-
Divider Biasing & Coupling Capacitor)
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Common-Emitter Amplifiers (with Voltage-
Divider Biasing & Coupling Capacitor)- Cont.
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Common-Emitter Amplifiers (with Voltage-Divider
Biasing & Coupling Capacitor & Emitter Resistor)
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DC & AC Load Lines
• Dc load line is used to find Q-point
• Ac load line is used to determine
graphically the operation of a BJT amplifier
• Dc and ac load lines are essentially different
since capacitors appear as an open circuit
for a de operation but a short circuit for an
ac operation
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DC Load Line
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AC Load Line
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Maximum Output Symmetrical Swing
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Saturation
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Cutoff
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Example (1): Calculate BJT Circuit
Parameters
• Determine the small-signal voltage gain, input
resistance, and output resistance of the circuit
shown in attached Figure. Assume the transistor
parameters are: β=100, VBE(on) =0.7V, and
VA=100V
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31
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• In the figure, let β=150,VA=200V, VCC=7.5V, VBE(on)=0.7V,
RC=15KΩ, RB=100kΩ, and VBB=0.92V.
a) Determine the small-signal hybrid- parameters rπ, gm, and r0
b) Find the small-signal voltage gain Av
Example 2