<< Chapter < Page Chapter >> Page >

Refering to the circuit in Fig. (6.26) we see that there are eight different collector voltages and four different Diode anode voltages:

1) input darlington pair Q 1 and Q 2 correspond to one collector voltage,

2) input darlington pair Q 4 and Q 5 correspond to second collector voltage,

3) Q 6 , Q 8 and Q 12 correspond to the third voltage namely Vcc collector voltage since they are in CC (Common Collector) mode,

4) Q 3 , Q 7 , Q 10 , Q 11 , Q 13 correspond to fourth, fifth, sixth, seventh, and eighth collector voltages;

5) there are four different diode anode voltages corresponding to D 1 , D 2 , D 3 , D 4 .

Corresponding to these twelve different quiescent voltages which are Vcc or less but always greater than -V EE , we have twelve isolated islands as seen in Fig. (6.27) where each isolated island is marked by thick border lines.

The isolated islands containing Q 6 , Q 8 and Q 12 and connected to Vcc contains all resistances R 1 to R 11 and R X and R Y . Resistances are realized by an elongated strip of p diffusion and any point on the resistances is less than Vcc or at most Vcc. In order that resistances may be isolated from n epi layer and hence from one another, n epi layer i.e. the isolated island must be at most positive potential i.e. Vcc. Then only all resistances will be reverse biased with respect to the n epi layer.

Fig(6.26) Complete circuit diagram of MC 1530/31 chip, with the points of different contact pads marked

Fig(6.27) Twelve isolated islands and placement of transistors, diodes and resistors on the islands have been indicated. The detailed structure of the devices have not been given.

In Fig. (6.27) complete layout of MC-1530 is given. In the chip layout following are the contacts connected to the header leads:

Contact(a) connects substrate to contact(4) which is held at -V EE .______________________Contact(b) connects the isolated island containing resistances and CC transistors to contact(6) which is held at +Vcc._________________________________________________________________________________________________________Contact(1’) and (2’) are input connections for MC-1530, ___________________________________________Contact(1) and (2) are input connections for MC-1531__________________________________________________________Contact(5) is output,_________________________________________________________________________________________Contact(3) is ground,_________________________________________________________________________________________Contact(7) , (8), (9)and (10) are monitoring points at V B11 , V E8 , V C5 , V C1 respectively.

In MC 1530-31, each transistor and diode configuration of transistor contains buried layers. The epilayer is 0.5 Ω cm. This allows BV CEO to be 20V. But because of buried layer the collector series resistance (r sc ) or saturation resistance are less than 50Ω. Hence with V CC ± 9V, an output swing of 16V p-p is achieved without endangering the output transistors Q 13 , Q 12 and at the same time r sc does not affect the ability to drive loads down to 500Ω.

In the design of MC1530-31, the critical d.c. levels are kept a function of resistor ratios and not of absolute values. This is because in I.C. technology, diffused resistance ratios with much closer tolerance (typically 5 to 6 %) can be achieved as compared to the tolerance of absolute values (30 to 50 %). That is matching tolerance is much narrower than absolute tolerance. Therefore output d.c. level (V 0 ) is a function of only resistor ratios – not of the absolute value of any resistor or of the beta of any device of the circuit. V o is given by Eq.(6.5)

Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
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
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
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.
Bharti
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
Daniel
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
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
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
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
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.
Tarell
what is the actual application of fullerenes nowadays?
Damian
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.
Tarell
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.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
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.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
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?

Ask