Amplifier Bias Participation Activity
•
k’n = 600 uA/V2
•
Vt = 1.0 V
•
W/L = 3
•
l = 0 V-1
<
9! =
=
;"# <
9! =
2 =
;"#
>$% − @& >!% −
>$% − @&
(
' (
( >!%
1 + D>!%
For ID = 1.5 mA, VDD = 5 V, calculate:
(a) VGS, RD, s.t. VDS = 2.5 V
Amirtharajah, EEC 111 Spring 2023
56
Us
OU
UD
VD
Up Up IDR 2.50
5 1.5mA R
i
I
15mA
E
Ugs Vt
GoopA 02 3
Ves L 290
R 1.67kt
since 1 0
Vas 17
NMOS Bias Participation Activity 2
• k’n = 600 uA/V2
• Vt = 1.0 V
• W/L = 3
• l = 0 V-1
Calculate ID for:
<
9! =
=
;"# <
9! =
2 =
;"#
>$% − @& >!% −
>$% − @&
(
' (
( >!%
1 + D>!%
Amirtharajah, EEC 111 Spring 2023
(a) VG = 1.1 V, VS = 1.0 V, VD = 5.0 V
(b) VG = 3.0 V, VS = 0.5 V, VD = 5.0 V
(c) VG = 3.0 V, VS = 0.5 V, VD = 1.0 V
55
Cal Up
VousVas UE
5 1 40
0.90
Vas Vor
f GoopAlu
i
3
b Ups 5 0.5 4.50
10.1
112 729mA
Vor Ut
4 1 50
i Uns Vor
I GoopA V
i
C
Vas
3 2.5 112 2 025mA
f 0.5 0.5V
Vor Vas Vt
2.5V
2.5 170.5
I 10.512
i Uns c Vor
i
600pA V 3
1.125mA