Analog Design Essentials
Available from Design
Page 34
Analog Design Essentials
Willy Sansen 10-05 0134
Transition Voltage VGSt for different L
(VGSt-VT)t = 2n ≈ 70 mV
kT
q
IDSt ≈ 2 µA for = 10
W
L
kT
q
(VGSt-VT)t = 2n
Is independent of channel length L
Is still true in … years !
IDSt ≈ K
’
n
W
L(2n )
2kT
q
for nMOST
Transition Voltage VGSt for different L
(VGSt-VT)t = 2n ≈ 70 mV
kT
q
IDSt ≈ 2 µA for = 10
W
L
kT
q
(VGSt-VT)t = 2n
Is independent of channel length L
Is still true in … years !
IDSt ≈ K
’
n
W
L(2n )
2kT
q
for nMOST
Page 66
Willy Sansen 10-05 0166
fT versus inversion coefficient i
i =
IDS
IDSt
0
0.5
1
0.01 0.1 1 10 100
GM=
1 - e - i
i
=fT
fTH
i (1 - e - i )
GM
fT
fTH
fT versus inversion coefficient i
i =
IDS
IDSt
0
0.5
1
0.01 0.1 1 10 100
GM=
1 - e - i
i
=fT
fTH
i (1 - e - i )
GM
fT
fTH
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