Small Signal Model MOS FieldEffect Transistors (MOSFETs). 1. Quiz No 3 DE 27 (CE). 200307. R out. Draw small signal model (4) Find expression for R out (2) Prove v o /v sig = ( β 1 α 2 R C )/(R sig +r π ) (4).
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200307
Rout.
Figure 4.2 The enhancementtype NMOS transistor with a positive voltage applied to the gate. An n channel is induced at the top of the substrate beneath the gate.
iD = iS, iG = 0
Largesignal equivalentcircuit model of an nchannel MOSFET : Operating in the saturation region.
Largesignal equivalentcircuit model of an pchannel MOSFET : Operating in the saturation region.
Conceptual circuit utilized to study the operation of the MOSFET as a smallsignal amplifier.
The DC BIAS POINT
To Ensure Saturationregion Operation
Total instantaneous voltages MOSFET vGSand vD
Smallsignal MOSFET ‘π’ models for the MOSFET
Common Source amplifier circuit MOSFET
Example 410
‘T’ Model
Amplifiers Configurations MOSFET
Smallsignal analysis performed directly on the amplifier circuit with the MOSFET model implicitly utilized.
Commonsource amplifier circuit with the MOSFET model implicitly utilized.
with a resistance RSin the source lead
Smallsignal equivalent circuit with circuit with the MOSFET model implicitly utilized.ro neglected.
Smallsignal Analysis. circuit with the MOSFET model implicitly utilized.
Voltage Gain : CS with R circuit with the MOSFET model implicitly utilized.S
Smallsignal equivalent circuit directly on Circuit circuit with the MOSFET model implicitly utilized.
A commongate amplifier based on the circuit circuit with the MOSFET model implicitly utilized.
A smallsignal equivalent circuit circuit with the MOSFET model implicitly utilized.
A smallsignal Analusis : CG circuit with the MOSFET model implicitly utilized.
A smallsignal Analusis : CG circuit with the MOSFET model implicitly utilized.
Small signal analysis directly on circuit circuit with the MOSFET model implicitly utilized.
The commongate amplifier fed with a currentsignal input. circuit with the MOSFET model implicitly utilized.
A commondrain or sourcefollower amplifier. circuit with the MOSFET model implicitly utilized.
Smallsignal equivalentcircuit model circuit with the MOSFET model implicitly utilized.
Smallsignal Analysis : CD circuit with the MOSFET model implicitly utilized.
(a) circuit with the MOSFET model implicitly utilized. A commondrain or sourcefollower amplifier :output resistance Rout of the source follower.
(a) circuit with the MOSFET model implicitly utilized. A commondrain or sourcefollower amplifier. : Smallsignal analysis performed directly on the circuit.
Common Source Circuit (CS) circuit with the MOSFET model implicitly utilized.
Common Source Circuit (CS) With R circuit with the MOSFET model implicitly utilized.S
Common Gate Circuit (CG) circuit with the MOSFET model implicitly utilized.
Current Follower
Common Drain Circuit (CD) circuit with the MOSFET model implicitly utilized.
Source Follower
Problem 544 circuit with the MOSFET model implicitly utilized.
SOLUTION : DC Analysis circuit with the MOSFET model implicitly utilized.
SOLUTION : DC Analysis circuit with the MOSFET model implicitly utilized.
IE
Check for Active Mode
IB
Solution Small Signal Analysis circuit with the MOSFET model implicitly utilized.
Solution Small Signal Analysis circuit with the MOSFET model implicitly utilized.
Solution Small Signal Analysis : circuit with the MOSFET model implicitly utilized.Input Resistance
ib
+
vb

Rin
Itest
IE
IRC
IE/(1+ß)
Rout
Solution Small Signal Analysis : circuit with the MOSFET model implicitly utilized.Voltage Gain
+
veb


Vo
+
+
vi

Solution Small Signal Analysis : circuit with the MOSFET model implicitly utilized.Voltage gain
+
veb

+
vi

Solution Small Signal Analysis : circuit with the MOSFET model implicitly utilized.Voltage Gain
+
vi

Solution Small Signal Analysis : circuit with the MOSFET model implicitly utilized.Voltage Gain
Solution Small Signal Analysis : circuit with the MOSFET model implicitly utilized.Voltage Gain

Vo
+
+
vi

Problem circuit with the MOSFET model implicitly utilized.
Small Signal Model MOSFET : CD circuit with the MOSFET model implicitly utilized.
Solution Small Signal Analysis : circuit with the MOSFET model implicitly utilized.Input Resistance
1/gm
D
gmvsg
Ig=0
Rin
1/g circuit with the MOSFET model implicitly utilized.m
D
gmvsg
Solution Small Signal Analysis : Output ResistanceItest
ID
IRD
Vtest
IG=0
Rout
Solution Small Signal Analysis : circuit with the MOSFET model implicitly utilized.Voltage Gain
1/gm
D
gmvsg
+
vsg


+
+
vi

Solution Small Signal Analysis : circuit with the MOSFET model implicitly utilized.Voltage gain
1/gm
D
gmvsg
+
vsg

+
vi

Solution Small Signal Analysis : circuit with the MOSFET model implicitly utilized.Voltage Gain
+
vi

Solution Small Signal Analysis : circuit with the MOSFET model implicitly utilized.Voltage Gain
Solution Small Signal Analysis : circuit with the MOSFET model implicitly utilized.Voltage Gain

+
+
vi

Solution Small Signal Analysis circuit with the MOSFET model implicitly utilized.
Small Signal Model circuit with the MOSFET model implicitly utilized.
+ circuit with the MOSFET model implicitly utilized.
vgs2

+
vsg1

Solution P6127(f)ig1=0
+
vi

VBE=0.7 V
β =200
K’n(W/L)=2mA/V2
Vt=1V
Figure P6.123
Figure P6.123
V circuit with the MOSFET model implicitly utilized.BE=0.7 V
β =200
K’n(W/L)=2mA/V2
Vt1=1V
Vt2=25mV
DC Analysis
1mA
2V
IG=0
0.7V
I=0.7/6.8=0.1mA
ig=0
+
+
vi
vbe2


ii
ig=0
+
vi

Rin