Lect_13 - ECE 442 ECE 442 SolidState Devices Circuits 13...

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CE 442 ECE 442 Solid State Devices & Circuits 13. Advanced IC Techniques Part 1 Jose E. Schutt-Aine lectrical & Computer Engineering Electrical & Computer Engineering University of Illinois [email protected] ECE 442–Jose Schutt Aine 1
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Transfer Function Representation In general, the transfer function of an amplifier can be xpressed as      12 ... () m Hm sZ Fs a PsP sP  expressed as      ... m sPsP Z Z e the ros f the transfer function Z 1 , Z 2 ,…Z m are the zeros of the transfer function P P re the oles f the transfer function P 1 , P 2 ,…P m are the poles of the transfer function a complex number = + j ECE 442–Jose Schutt Aine 2 s is a complex number s j
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3dB Frequency Determination Designer is interested in midband operation () MH A sA F s However needs to know upper 3 dB frequency In many cases some conditions are met: I ay ae oeoi i o ae e Zeros are infinity or at very high frequencies One of the poles ( P1 ) is at much lower frequency than other poles ( dominant pole) If the conditions are met then F H (s) can be approximated by: 1 and we have H P F s  ECE 442–Jose Schutt Aine 3 1 1 1/ HH P s
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3dB Frequency Determination If the lowest frequency pole is at least 4 times away from the nearest pole or zero, it is a dominant pole If there is no dominant pole, the 3 dB frequency H can be approximated by: 11 / 2  22 12 1/ ... ... H PP ZZ      ECE 442–Jose Schutt Aine 4
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High-Frequency Behavior - Example 5 1/ 1 0 ) s s 5 ECE 442–Jose Schutt Aine    44 () 1 0 4 1 0 H Fs ss 
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Open-Circuit Time Constants 2 12 2 1 ... () n n H n as as as Fs s bs bs  1 ... n bs bs The coefficients a and b are related to the frequencies f the zeros and poles respectively of the zeros and poles respectively.
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This note was uploaded on 05/05/2010 for the course ECE 329 taught by Professor Franke during the Spring '08 term at University of Illinois at Urbana–Champaign.

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Lect_13 - ECE 442 ECE 442 SolidState Devices Circuits 13...

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