Chapter_12_-_Filters_and_Tuned_Amplifiers2011

Chapter_12_-_Filters_and_Tuned_Amplifiers2011 - Faculty of...

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Unformatted text preview: Faculty of Science and Technology Department of Electrical and Computer Engineering 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 | kentam@umac.mo s Why Filters? s Objectives s Filter Basics s Specification s Filter Transfer Function Approximation s Filter Synthesis s Second-order Filters s Switched-capacitor Filters s Tuned Amplifiers Chapter Outline hy Filters? hy Filters? hy Filters? Why Filters? Noise Removal s Our signal has different frequency components in practice, multiple of sine waves for example! T i m e D o m a i n T i m e D o m a i n F r e q u e n c y D o m a i n F r e q u e n c y D o m a i n Why Filters? Noise Removal F F T F F T Noise @100 Hz Noise @380 Hz Signal @600 Hz Why Filters? Noise Removal × Hz Hz Hz 600 380 100 1 Filter Response Why Filters? Signal Smoothing I n s t r u m e n t a t i o n I n s t r u m e n t a t i o n Why Filters? Signal Selection s Application in GPS - Filter (Triplexer and Duplexer in the Figure) is used to select the signals amongst PCS, GPS and others location communications s 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 the needed TV signals Why Filters? Signal Selection Objectives Objectives bjectives s 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 s Objectives s Analysis – classify and characterize different filter responses, structures and implementations s Design – design filter using both active and passive implementations according to specification Objectives Filter Basics Filter Basics Filter Basics Filter Basics - Specification Component Limitation s Passive Filter Implementation ( R , L , C alone) s DC to 100 kHz s Impractical in higher frequency as inductor is too bulky s Active Filter Implementation (transistors, operational amplifier, R , L , C and so forth) s Higher frequency operation s Good for integrated circuit implementation s Stability is of concern Filter Basics - Specification Implementation Alternative Audio ( ~kHz ) and Video ( ~MHz ) applications s 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 s 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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This note was uploaded on 02/27/2012 for the course ELEC 232 taught by Professor Terry during the Spring '12 term at University of Macau.

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Chapter_12_-_Filters_and_Tuned_Amplifiers2011 - Faculty of...

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