EE3110-AEC-2008-Revision & Frequency Response

EE3110-AEC-2008-Revision & Frequency Response - EE3110:...

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Unformatted text preview: EE3110: Analogue Electronic Circuits Revision & Frequency Response Prerequisite and precursor Prerequisite: EE2003 Circuit Theory Circuit components, sources, divider network, Thévenin and Norton RC circuits Ohms law, Kirchhoff’s current law, Kirchhoff’s voltage law Precursor: EE2106 Electronic Devices and Circuits Bipolar Junction Transistor (BJT) Field Effect Transistor (FET) Biasing circuits Small signal analysis of amplifier circuits Low and high frequency response of amplifier circuits As a pre-requisite for: EE4101 Modern Power Electronics, EE4143 Audio-Visual Circuit Techniques and EE4115 Audio- Visual Engineering As a pre-cursor for: EE5430 Advanced CMOS technology Some examples of where you will find analogue electronic circuits 1. Transistor Amplifier Circuit Analysis 1. Amplifier Characteristics R C R 1 V CC I/ P O/ P C C C B R 2 R E C C Co mm on- Em itter con figur ed amp lifier Low-frequency Mid-frequency High-frequency Rashid: ch8 Boylestad: ch9 Low-frequency Effects due to coupling capacitor C C and bypass capacitor C B is dominant and reduces the gain (transfer function). High-frequency Effects due to junction capacitance and stray capacitance in parallel with the amplifier reduces the gain (transfer function). ∞ ⇒ = C j jX C ϖ 1 ⇒ ϖ as 1 ⇒ = C j jX C ϖ ∞ ⇒ ϖ as Mid-frequency low-frequency effects of coupling and bypass capacitors negligible since X C ⇒ High-frequency effects of junction and stray capacitance negligible since X C ⇒∞ mi d- freq ue nc y low- freq . high- freq . Transfer function Fr equ enc y 1. A.C. Small Signal Analysis at Mid-frequency The power supply is an ideal voltage source and therefore behaves as an a.c. short circuit. The coupling and bypass capacitors also behaves like an a.c. short circuit, since its impedance is zero. Small signal parameters remain constant and operation is linear. Circuit can be simplied for analysis under a.c. conditions and at mid-frequency, using the previous circuit as an example, R C R 1 I/ P I/ P O/ P O/ P R 2 BJ T Mo del R // R 1 2 R C A. C. Sma ll signal equ ivalent circui t at mi d-freq uenc y Transistor Model BJT model: approximate π model BJT model: approximate transconductance model...
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This note was uploaded on 01/11/2011 for the course EE 3110 taught by Professor Wingshingchan during the Fall '08 term at City University of Hong Kong.

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EE3110-AEC-2008-Revision & Frequency Response - EE3110:...

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