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Chapter_12_-_Filters_and_Tuned_Amplifiers2011

Chapter_12_-_Filters_and_Tuned_Amplifiers2011 - Chapter 12...

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Faculty of Science and Technology Department of Electrical and ComputerEngineering Chapter 12 | Filters Chapter 12 | Filters Chapter 12 | Filters a a nd Tuned Amplifier nd Tuned Amplifier nd Tuned Amplifier s s ELEC321 Applied Electronics III by Prof. K. W. Tam | [email protected]
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square4 Why Filters? square4 Objectives square4 FilterBasics square4 Specification square4 Filter Transfer Function Approximation square4 Filter Synthesis square4 Second-order Filters square4 Switched-capacitor Filters square4 Tuned Amplifiers Chapter Outline
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Why Filters? Why Filters? Why Filters?
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Why Filters? Noise Removal square4 Our signal has different frequency components in practice, multiple of sine waves for example! T ime Domai n T ime Domai n F r eq uency D o mai n F r eq uency D o mai n
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Why Filters? Noise Removal FFT FFT Noise @100 Hz Noise @380 Hz Signal @600 Hz
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Why Filters? Noise Removal × Hz Hz Hz 600 380 100 1 0 0 Filter Response
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Why Filters? Signal Smoothing I nstr umentation I nstr umentation
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Why Filters? Signal Selection square4 Application in GPS - Filter (Triplexerand Duplexer in the Figure) is used to select the signals amongst PCS, GPS and others location communications
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square4 Application in Digital TV - There exist various analog/digital terrestrial or cable TV standards such as NTSC, PAL, ATSC, and DVB that use the frequency range from 48 to 860 MHz. Filter is used to select theneeded TV signals Why Filters? Signal Selection
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Objectives Objectives Objectives
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square4 A filter studied in this chapter is a circuit that performs a frequency- selection function : passing signals whose frequency spectrum lies within a specified range, and stopping signals whose frequency spectrum falls outside this range. Objectives
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square4 Objectives square4 Analysis –classify and characterize different filter responses, structures and implementations square4 Design – designfilter using both active and passive implementations according to specification Objectives
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Filter Basics Filter Basics Filter Basics
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Filter Basics -Specification Component Limitation
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square4 PassiveFilter Implementation( R , L , C alone) square4 DC to 100kHz square4 Impractical in higher frequency as inductor is too bulky square4 Active Filter Implementation(transistors, operational amplifier, R , L , C and so forth) square4 Higher frequency operation square4 Good for integrated circuit implementation square4 Stability is of concern Filter Basics -Specification Implementation Alternative Audio ( ~kHz ) and Video ( ~MHz ) applications
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square4 The circuits that we design, having a prescribed variation of the magnitude, phase, or related quantities as a function of frequency, are known as Filters ( ) ( ) ( ) ( ) ( ) ω φ ω j i o e j T s v s v s T = = Filter Basics -Specification Transfer Characteristic of Filter Specifications of filter
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square4 We reject component of a signal by designing a filter that provides attenuation over a band of frequencies , and we retain components of a signal through the absence of attenuation or perhaps, even gain .
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