EE3110-AEC-2008-Revision & Frequency Response

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

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EE3110: Analogue Electronic  Circuits Revision & Frequency Response
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Prerequisite and precursor Prerequisite: EE2003 Circuit Theory Circuit components, sources, divider network, Th é venin 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
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Some examples of where you will find analogue  electronic circuits
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1. Transistor Amplifier Circuit Analysis 1. Amplifier Characteristics R C R 1 V C C I / P O / P C C C B R 2 R E C C C o m m o n - E m i t t e r c o n f i g u r e d a m p l i f i e r Low-frequency Mid-frequency High-frequency Rashid: ch8 Boylestad: ch9
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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 0 ϖ as 0 1 = C j jX C ϖ ϖ as
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Mid-frequency low-frequency effects of coupling and bypass capacitors  negligible since X C 0 High-frequency effects of junction and stray capacitance  negligible since X C ⇒∞ m i d - f r e q u e n c y l o w - f r e q . h i g h - f r e q . T r a n s f e r   f u n c t i o n F r e q u e n c y
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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 B J T M o d e l R / / R 1 2 R C A . C .   S m a l l   s i g n a l   e q u i v a l e n t c i r c u i t   a t   m i d - f r e q u e n c y
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Transistor Model BJT model: approximate  π  model BJT model: approximate transconductance model FET model: transconductance model Once an equivalent circuit for the transistor is obtained, circuit  analysis can be applied to determine, Voltage gain  A v Input impedance Z in Output impedance Z out
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