Download CMOS Digital Integrated Circuits Chapter 5 MOS Inverters: Static Characteristics

Survey
yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

page
1
page
2
page
3
page
4
page
5
page
6
page
7
page
8
page
9
page
10
page
11
page
12
page
13
page
14
page
15
page
16
page
17
page
18
page
19
page
20
Document related concepts
no text concepts found
Transcript 
CMOS Digital Integrated Circuits
Chapter 5
MOS Inverters:
Static Characteristics
S.M. Kang and Y. Leblebici
1
© CMOS Digital Integrated Circuits – 3rd Edition
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
Ideal Inverter
Voltage Transfer
Characteristic (VTC)
of the ideal inverter
2
© CMOS Digital Integrated Circuits – 3rd Edition
Generic Inverter VTC
Voltage Transfer
Characteristic (VTC)
of a typical inverter
3
© CMOS Digital Integrated Circuits – 3rd Edition
Noise Margins
Propagation of digital signals under the influence of noise
4
© CMOS Digital Integrated Circuits – 3rd Edition
Noise Margins
Definition of
noise margins
5
© CMOS Digital Integrated Circuits – 3rd Edition
Noise Margins
Nominal output
Output under noise
The nominal operating
region is defined as the
region where the gain
is less than unity !
6
© CMOS Digital Integrated Circuits – 3rd Edition
CMOS Inverter Circuit
7
© CMOS Digital Integrated Circuits – 3rd Edition
CMOS Inverter Circuit
8
© CMOS Digital Integrated Circuits – 3rd Edition
CMOS Inverter Circuit
determine
noise
margins
inversion (switching)
threshold voltage
9
© CMOS Digital Integrated Circuits – 3rd Edition
CMOS Inverter Circuit
nMOS transistor current-voltage characteristics
10
© CMOS Digital Integrated Circuits – 3rd Edition
CMOS Inverter Circuit
pMOS transistor current-voltage characteristics
11
© CMOS Digital Integrated Circuits – 3rd Edition
CMOS Inverter Circuit
Intersection of current-voltage surfaces of nMOS and pMOS transistors
12
© CMOS Digital Integrated Circuits – 3rd Edition
CMOS Inverter Circuit
Intersection of current-voltage surfaces gives the VTC in the voltage plane
13
© CMOS Digital Integrated Circuits – 3rd Edition
CMOS Inverter Circuit
14
© CMOS Digital Integrated Circuits – 3rd Edition
CMOS Inverter Circuit
How to choose the kR ratio to achieve a desired inversion threshold voltage:
15
© CMOS Digital Integrated Circuits – 3rd Edition
CMOS Inverter Circuit
16
© CMOS Digital Integrated Circuits – 3rd Edition
Supply Voltage Scaling
VTC of a CMOS inverter
for different power supply
voltage values.
17
© CMOS Digital Integrated Circuits – 3rd Edition
Supply Voltage Scaling
VTC of a CMOS inverter,
when operated with a
supply voltage that is
smaller than (VTn + VTp ).
Æ Hysteresis behavior !
18
© CMOS Digital Integrated Circuits – 3rd Edition
CMOS Inverter Layout
19
© CMOS Digital Integrated Circuits – 3rd Edition
CMOS Inverter Layout
Mask layout
of the inverter
Simplified
cross-section
20
© CMOS Digital Integrated Circuits – 3rd Edition
Related documents