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Unformatted text preview: t Analysis of CS Stage §༊ Direct analysis yields slightly diﬀerent pole locaFons and an extra zero: ωz = gm
C XY ω p1 = 1
(1 + g m RD )C XY RThev + RThevCin + RD (C XY + Cout ) ω p2 = (1 + g m RD )C XY RThev + RThevCin + RD (C XY + Cout )
RThev RD (CinC XY + Cout C XY + CinCout ) EE105, Fall 2013 Lecture 21 – Slide 15 Prof. Ming C. Wu I/O Impedances of CS Stage λ =0 Zin ≈ 1
jω "CGS + (1 + gm RD ) CGD $
#
% EE105, Fall 2013 Z out = Lecture 21 – Slide 16 1
jω [CGD + CDB ]  RD Prof. Ming C. Wu 8 CG Stage: Pole Frequencies CG stage with MOSFET capacitances shown ω p, X = λ =0 1
⎛ྎ
1 ⎞ྏ
⎜ྎ RS 
⎟ྏC X
⎜ྎ
g m ⎟ྏ
⎝ྎ
⎠ྏ C X = CGS + C SB ω p ,Y = 1
RD CY CY = CGD + C DB
Lecture 21 – Slide 17 EE105, Fall 2013 Prof. Ming C. Wu AC Analysis of Source Follower λ =0 vout
vin CGS
gm
=
2
a( jω ) + b( jω ) + 1 EE105, Fall 2013 1 + ( jω ) §༊ The transfer funcFon of a source follower can be obtained by direct AC analysis, similarly as for the emi[er follower a= RS
(CGD CGS + CGD C SB + CGS C SB )
gm b = RS CGD +
Lectu...
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This note was uploaded on 01/22/2014 for the course EE 105 taught by Professor Kingliu during the Fall '07 term at University of California, Berkeley.
 Fall '07
 KingLiu
 Frequency

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