EE 420L - Lab 8
Characterization of the CD4007 CMOS transistor array
Authored
by Nicholas Moya
April 16th, 2015
moyan1@unlv.nevada.edu
The purpose of this lab is to collect experimental data of the transistors used in the CD4007.pdf CMOS
transistor array, use that data to make parameters for simulations in
LTspice and compare the simulations with experimental data. After
comparison, we can augment our parameters to better simulate our
experimental results.
Experimentally generate, for the NMOS device, plots of:
1. ID v. VGS (0 < VGS < 3 V) with VDS = 3 V
2. ID v. VDS (0 < VDS < 5 V) for VGS varying from 1 to 5 V in 1 V steps, and
3. ID v. VGS (0 < VGS < 5 V) with VDS = 5 V for VSB varying from 0 to 3 V in 1 V steps.
1) Experiment NMOS
Scope reading
2) Experiment NMOS
VGS = 1V
VGS = 2V
VGS = 3V
VGS = 4V
VGS = 5V
3) Experiment NMOS
VBS = 0
VBS = 1
VBS = 2
VBS = 3
1) Experiment PMOS
3) Experiment PMOS
VSG = 5V
VSG = 4V
VSG = 3V
VSG = 2V
VSG = 1V
3) Experiment PMOS
Assuming
that the length of the NMOS is 5 um and its width is 500
um calculate the oxide thickness if Cox (= C'ox*W*L) = 5 pF.
From this data, we create a LTspice model with the following parameters:
.MODEL N_level1 NMOS LEVEL = 1
+ TOX = 1.13E-14
+ VTO = 0.8
+ GAMMA = 1
+ KP = 9.38E-6
*
.MODEL P_level1 PMOS LEVEL = 1
+ TOX = 1.13E-14
+ VTO = 0.8
+ GAMMA = 1
+ KP = 4.8E-6
Using these models, we recreate the 3 experiments in simulation and gather our results.
1) Simulation NMOS
Schematic
Simulation
2) Simulation NMOS
Schematic
VGS = 1V
VGS = 2V
VGS = 3V
VGS = 4V
VGS = 5V
3) Simulation NMOS
Schematic
VGS varied 0 to 3 V (VSB = 0)
VGS varied 1 to 4 V (VSB = 1)
VGS varied 2 to 5 V (VSB = 2)
VGS varied 3 to 5 V (VSB = 3)
1) Simulation PMOS
Schematic
Simulation
2) Simulation PMOS
Schematic
VSG = 1V
VSG = 2V
VSG = 3V
VSG = 4V
VSG = 5V
3) Simulation PMOS
Schematic
VSG varied 0 to 3 V (VBS = 0)
VSG varied 1 to 4 V (VBS = 1)
VSG varied 2 to 5 V (VBS = 2)
VSG varied 3 to 5 V (VBS = 3)
Inverter - Using the chip, we can also build an inverter. The simulation data is provided below:
Inverter schematic
Simulation part 1
Simulation part 2
This is the experiemtal data provided from the scope readings:
Vin = Yellow (rising), Vout = Blue (falling)
Vin = Yellow (falling), Vout = Blue (rising)