# Lect_14 - ECE442 SolidStateDevices&Circuits 14. Part2 Jose...

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ECE 342–Jose Schutt Aine 1 ECE 442 Solid State Devices & Circuits 14. Advanced IC Techniques Part 2 Jose E. Schutt-Aine Electrical & Computer Engineering University of Illinois [email protected]

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2 ECE 342–Jose Schutt Aine IC - Common Gate Amplifier Substrate is not connected to the source Î must account for body effect 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 →+
ECE 342–Jose Schutt Aine 3 () im m b i r o ig g v i =+ + mm b i o io i i L ro i oo L o 1 gg v r vv vi R ii rr R 1 r ⎛⎞ ++ ⎜⎟ −− ⎝⎠ == = + with is = IC - Common Gate Amplifier

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ECE 342–Jose Schutt Aine 4 () io L in im m b o vr R R i1 ggr + ≡= ++ As oi n mm b 1 r, R 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 + IC - Common Gate Amplifier
ECE 342–Jose Schutt Aine 5 () 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 ) to the input resistance. ( ) vo m mb o A 1g g r + The open circuit voltage gain is: The voltage gain of the loaded CG amplifier is: L vv o Lo v o s R GA R rA R = ++ IC - Common Gate Amplifier

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ECE 342–Jose Schutt Aine 6 () 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 + + CG Output Resistance
7 ECE 342–Jose Schutt Aine CG Amplifier as Current Buffer s is vo out R GG 1 R = ± G is is the short circuit current gain

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8 ECE 342–Jose Schutt Aine - Include C L to represent capacitance of load C gd is grounded No Miller effect High-Frequency Response of CG
ECE 342–Jose Schutt Aine 9 P1 gs s mm b 1 f 1 2C R gg π = ⎛⎞ ⎜⎟ + ⎝⎠ & () P2 g dL L 1 f 2C C R = + f P2 is usually lower than f p1 f P2 can be dominant Both f P1 and f P2 are usually much higher than f P in CS case 2 poles: High-Frequency Response of CG

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10 ECE 342–Jose Schutt Aine () oL in o L ee rR R r R 1 r1 r β + = ++ + vo m o A 1g r = + ( ) ' out o m o e Rr 1 g r R =++ ' RRr π = & e r r 1 = + CB Amplifier
ECE 342–Jose Schutt Aine 11 High-Frequency Analysis of CB Amplifier in 3dB x SE 1 rr CR R 11 π ω β = ⎡⎤ + ⎢⎥ ++ ⎣⎦ && out 3dB L 1 μ = The amplifier’s upper cutoff

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## This note was uploaded on 01/24/2012 for the course ECE 342 taught by Professor Nareshshanbhag during the Spring '11 term at University of Illinois, Urbana Champaign.

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Lect_14 - ECE442 SolidStateDevices&Circuits 14. Part2 Jose...

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