HW1
1. Plot Vds-Ids and Vgs-Ids curves of a NMOS transistor with
(W/L)=(10um/0.18um) in TSMC 0.18um technology.
Use following equation for triode region;
where
2
nCox  W  
VDS 
ID 
  VGS  VT VDS 
 1  VDS 
1  VDS / c L  L  
2 
c  2sat / n
Use following equation for saturation region;
ID 
nCox
1  VDSAT
where
W

/ c L  L
VDSAT 
2

VDSAT

 VGS  VT VDSAT 
 1  VDS 
2


1
VGS  VT 
1  VGS  VT  / c L
Assume sat=10^5 m/s and =0.06/V. You need to use effective length, but
assume that W=Weff. Find out the technology parameters from the BSiM
model file posted on the class web. You can download the model file from
www.mosis.org, too. BSIM3v3.3.0 manual would be a good reference. You
can download the manual through the link on the class web.
*IF* you have difficulties in finding VT and n, assume VT is 0.4V and n is a
constant.
HW1 continue
2. Plot Vds vs. small signal output resistance (ro) curves, and Vgs vs.
transconductance (gm) curves using the curves in Problem 1.
5 10
4
4
4.81410
1 10
5
8 10
4
2 10
4
4
9.62310


I d 0.8  V ds
I d 1.0  V ds3 104
I d 1.2  V ds
4
I d 1.4  V ds2 10
I d 1.6  V ds
I d 0.6  V ds  4
4 10
1 10


I d V gs  0.66 104
I d V gs  0.8
4
4 10
I d V gs  1.0
I d V gs  0.4
4
0
0
0
0
0
0.5
1
1.5
V ds
2
2.5
3
0
0
0.5
1
1.5
2
2.5
3
0
V gs
Recommended scale:
Vds-Ids plot: Vds(0~3V w/ 0.1V step), Vgs(0.6~1.6V w/ 0.2V step)
Vgs-Ids plot: Vgs(0~2.5V w/ 0.1V step), Vds(0.4~1V w/ 0.2V step)
The example curves shown in this slide are generated using fictitious
device parameters, and are not realistic.
2.5
6 10
0.015
0.015
6.01410


r o 0.8  V ds
0.01
r o 1.0  V ds
r o 1.2  V ds
r o 1.4  V ds
0.005
r o 1.6  V ds
r o 0.6  V ds
1.51410
4
4
 4

4 10
g m V gs  0.6
g m V gs  0.8
g m V gs  1.02 104
g m V gs  0.4
5
0
0
0
0
0.5
1
1.5
V ds
2
2.5
3
3
0
0
0
0.5
1.5
1
2.5
2
V gs
The example curves shown in this slide are generated using fictitious
device parameters, and are not realistic.
2.5
• You can use any kinds of softwares;
– MathCad, Matlab, Excel, Mathmatica, Maple,
C/Basic/…
– Do not include your source code in your
homework!
• HW1 Due:
–
–
–
–
Wed, Sept. 2, 2009
6:00pm
E-mail submission is strongly encouraged
Please follow the guidelines for the email title and
the file name