bjt frequency response - kmuttwebstaff.kmutt.ac.th/~werapon.chi/m2_3/1_2014/m2_3_lecture_07_… ·...
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BJT Frequency Response
LF Response, Miller Theorem & HF Response
M2-3 Electrinics 1/30
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FR; Outline
- Introduction - Decibels - Bode Plot (Frequency Response) - Low Frequency Analysis - Miller Theorem - High Frequency Analysis
M2-3 Electrinics 2/30
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Introduction
- Previously, effects of capacitive elements are ignored
- Capacitor affect the LF & HF of amplifiers - Swept Frequencies are used to test - Logarithmic scales are both used in gain & frequency axes
M2-3 Electrinics 3/30
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Logarithm (I)
- Logarithm
M2-3 Electrinics 4/30
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Logarithm (II)
- Some useful logarithm
M2-3 Electrinics 5/30
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Logarithm (III)
- Semilog scale
M2-3 Electrinics 6/30
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Important points in log scale
M2-3 Electrinics 7/30
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Decibels
- Bel is the surname of Alexander Graham Bell
M2-3 Electrinics 8/30
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Advantage of Logarithm
Gain calculation made easier
M2-3 Electrinics 9/30
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Example of gain calculation
M2-3 Electrinics 10/30
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General Frequency Considerations
RC coupling
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Cut-Off or Half-Power Frequency
M2-3 Electrinics 12/30
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Bandwidth, BW
Linear
Log
M2-3 Electrinics 13/30
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Phase plot
M2-3 Electrinics 14/30
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Low Frequency Analysis
@ High Frequency
@ DC M2-3 Electrinics 15/30
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Voltage Divider
M2-3 Electrinics 16/30
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Gain Equation
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Bode Plot of Low Frequency Region
M2-3 Electrinics 18/30
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Example of LF Bode Plot
M2-3 Electrinics 19/30
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Phase response of LF region
M2-3 Electrinics 20/30
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Miller Effect Capacitance (I)
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Miller Effect Capacitance (II)
CMo ~ Cf ; AV >>1
M2-3 Electrinics 22/30
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High Frequency Analysis
M2-3 Electrinics 23/30
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Parasitic Capacitances
M2-3 Electrinics 24/30
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HF Model of BJT Amplifier
M2-3 Electrinics 25/30
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Parameter Variation
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Full Frequency Response
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Square-wave Testing
M2-3 Electrinics 28/30
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Results of Square-wave Tesing
M2-3 Electrinics 29/32
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Rise Time & Tilt
or
M2-3 Electrinics 30/32
Where fHi is high cut off & fLo is low cut off frequencies. The fs is the frequency of square wave signal
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Rise Time & Tilt; example
M2-3 Electrinics 31/32
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Memo
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Free Logarithmic Graph Paper from http://incompetech.com/graphpaper/logarithmic/
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Free Logarithmic Graph Paper from http://incompetech.com/graphpaper/logarithmic/
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