<< Chapter < Page Chapter >> Page >
SsPD_Chapter 7_Part 5_continued 3 gives the stick diagrams of CMOS inverter and two-input CMOS NAND Gate.

SSPD_Chapter 7_Part 5_Stick Diagram of CMOS Logic Gates_continued 3

7.5.2. Stick Diagrams of CMOS Logic Gates.

In Figure gives three alternative layouts of CMOS Inverter expressed by its corresponding stick diagram.

Blue colour- metal1, Red – Poly-Si, Green – N+ diffusion, Brown – P+ duffusion, Black Cross is CONTACT.

7.5.3. CMOS Two-input NAND Gate

Figure gives the circuit diagram and its alternative layout expressed in stick diagrams for a two-input NAND Gate.. Output Z = Complement(AB)

This means when A=1 and B=1 output is connected to GND bus by a low reesistance through Q1(ON) and Q2(ON) in series. When either of the two I/Ps is at ‘0’ low resistance path to GND is broken and a low reesistance path exists through Q3 or Q4 to 5V(Vdd) bus. Thus the condition for Output Z = Complement(AB) is satisfied.

In Figure, Q3 input is shorted to Q1 input and Q4 input is shorted to Q2. In the upper stick diagram, Q4 input and Q2 inpt are connected by the same Red Poly-Si line. But Q3 and Q1 input cannot be connected in the same way. If Q3 and Q1 inputs were connected by the same red line then it would short to the input of Q2 also which it should not. Therefore a metal line blue line is used to cross the red input of Q2. Metal blue line lies at an upper layer while red Poly-Si line lies at intermediate level therefore cross-over is permitted. Once the cross-over has taken place then the two terminals of blue metal line is connected to the two Poly-Si red inputs of Q3 and Q1.

Similarly 3-input NAND Gate can be designed. In case of 3-input NAND Gate we have Q1,Q2 and Q3 in series and Q4,Q5 and Q6 in parallel.

Q1 and Q4 are paired as CMOS, Q2 ans Q5 are paired as CMOS and Q3 and Q6 are paired as CMOS.

Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get the best Algebra and trigonometry course in your pocket!

Source:  OpenStax, Solid state physics and devices-the harbinger of third wave of civilization. OpenStax CNX. Sep 15, 2014 Download for free at http://legacy.cnx.org/content/col11170/1.89
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Solid state physics and devices-the harbinger of third wave of civilization' conversation and receive update notifications?