Lect_14 - ECE 442 ECE 442 SolidState Devices Circuits 14 Advanced IC Techniques q Part 2 Jose E Schutt-Aine Electrical Computer Engineering

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CE 442 ECE 442 Solid State Devices & Circuits 14. Advanced IC Techniques Part 2 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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IC - Common Gate Amplifier Substrate is not connected to the source must account for body effect rain signal current becomes Drain signal current becomes  D m gs mb bs ig v g v  And since g sb s vv Body effect is fully accounted for by using   mm m b gg g  2
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IC - Common Gate Amplifier  im m b i r o ig g v i  1  with is vv mm b i o io i i L ro i oo L gg v r vi R ii rr R      ECE 442–Jose Schutt Aine 3 o 1 r
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IC - Common Gate Amplifier  io L in im m b o vr R R i1 ggr   As oi n 1 r, R g  mm b gg If Li R, R    or m m b o i i vi v g gr v v    vo m mb o A 1g g r ECE 442–Jose Schutt Aine 4
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IC - Common Gate Amplifier  where oL L in o m mb o vo m mb o rR R 1 R ,A g g r Ag g A  Taking r o into account adds a component ( R L /A o ) the input resistance. to the input resistance. The open circuit voltage gain is:   vo m mb o A 1g g r  The voltage gain of the loaded CG amplifier is: L vv o R GA rA R ECE 442–Jose Schutt Aine 5 L ov o s RrA
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CG Output Resistance  xx m m b o vi g g v r v    with x s R or out o m mb o s out o vo s Rr 1 g g r R A R ECE 442–Jose Schutt Aine 6
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CG Amplifier as Current Buffer s is vo out R GG 1 R G is is the short circuit current gain 7
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High-Frequency Response of CG - Include CL to represent capacitance of load C gd is grounded No Miller effect 8
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High-Frequency Response of CG 2 poles: P1 gs s m b 1 f 1 2C R gg   mm  P2 dL L 1 f C C R   gd L 2C f P2 is usually lower than fp1 f P2 can be dominant Both f P1 and f P2 are usually much higher than f P in CS case ECE 442–Jose Schutt Aine 9
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CB Amplifier R  o L in o L ee rR R r R 1 r1 r  vo m o A 1g r   ' out o m o e Rr 1 g r R  r 10 ' RRr e r 1
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High-Frequency Analysis of CB Amplifier in 3dB 1 rr R R  The amplifier’s upper cutoff equency will From current gain analysis x SE CR 11     t3 d B 1 frequency will be the lower of these two poles.
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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_14 - ECE 442 ECE 442 SolidState Devices Circuits 14 Advanced IC Techniques q Part 2 Jose E Schutt-Aine Electrical Computer Engineering

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