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   Applications of Diodes
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Applications of Diodes - Electronics & Communication tutorials

Applications of Diodes
Now we will briefly consider a couple of applications for diodes. We’ll cover these in much more detail later.


Conversely, when vI < 0 , the ideal diode is "off" and there is no current through R.
Therefore, v0 = 0. We have "rectified" the input voltage with this circuit. This process of rectification will work for any type of input signal, whether it is periodic (as shown above) or not.



Digital logic gate. Diodes and resistors together can be used to make rudimentary logic gates. For example:

Assuming the voltages are 0 V for "low" signals and 5 V for the "high" signals, then the circuit shown above is a two-input OR gate:
o If vA = 5 V and vB = 0 or 5 V, then vY = 5 V.
o If vB = 5 V and vA = 0 or 5 V, then vY = 5 V.
for ideal diodes. This is an OR function Y=A+B.
Why do we have the resistor in this circuit? It’s a "clamp down" resistor and forces the voltage vY = 0 when vA = vB = 0. (What if there was no R? Wouldn’t the voltage be zero in this case as well?)
One huge complication of diodes (or any nonlinear circuit element) in an electrical circuit is the use of superposition in the analysis is disallowed! (The exception to this is if the analysis has been linearized for only small amplitude signals. We’ll see this linearization throughout the course.)

Consequently, nonlinear circuit analysis is usually much more complicated than linear circuit analysis. One often needs numerical analysis for solution, such as that provided by circuit simulation software.
Example N1.1 Determine the voltage V and current I in the circuit below.

This is a nonlinear circuit, so a completely different analysis procedure is required than what you’ve used in the past for linear circuits.
One process you can use to solve this problem is to try (i.e. guess) different on/off combinations for the diodes D1 and D2 until you achieve a physically plausible and self consistent solution.
For example, if D1 is "on" and D2 is "on," then V = 1 V and 3 V.
It is simply impossible to have two different voltages simultaneously at a node. Voltages must be single valued at all nodes. We conclude that D1 and D2 cannot both be "on" simultaneously.
Next, we try D1 "off" and D2 "on." This leads to V = 3 V and I = 8 mA.
This result is physically realistic and self consistent since with V = 3 V then the voltage drop across D1 requires that it be "off," which is what we have assumed.


Previous - Ideal Diodes

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Type of diode
I need short notes for all type of diode.


Posted By :-
 imteyaz86
Oct 27, 11:50:24 AM 0 4988
signals and system
hi i am venkatesh which author use in signal and system for gate


Posted By :-
 venkatesh.dace2
Oct 13, 4:38:08 PM 0 4779
Thank u
i need some links to download free ebooks multiple choice for my gate preparation - V.Vivek Sharma.


Posted By :-
 vvivekxp@yahoo.com
Oct 4, 9:56:42 AM 0 3315
study materials
i want to study materials of digital communication.


Posted By :-
 titon
Feb 6, 3:43:05 PM 4 9357
More examples of non linear circuit analysis
Notes are very simple to understand the concepts.


Posted By :-
 ruby2810
Sep 9, 3:17:49 PM 0 5304
study materials
can i get some study materials by online


Posted By :-
 shyama.km
Sep 4, 9:05:49 AM 0 4894
hiii plz give me basic information about electromegnetics
i have a dout between combination of electrostatics and megnetostatics


Posted By :-
 pandya.saga
Jul 29, 2:38:13 PM 0 3578
hi
pls send me a link on answered problems on electronic devices and circuit theory by boylestad and nashelsky.. ty


Posted By :-
 flux089
Jul 25, 11:21:28 PM 0 3981
electronics and communication
i am in 4th year


Posted By :-
 gauravjai24.ece.uit@gmail.com
Jun 10, 6:02:44 AM 0 3958
bjt
about bipolar device


Posted By :-
 vikashgupta160489
Feb 13, 2:11:36 PM 2 8399
h parameters of transister
i want h parameters of transister


Posted By :-
 vijaybaviskar007
Feb 11, 7:52:45 AM 3 12838
very good tutorials
the explanations r very easy to understand


Posted By :-
 blues2torn@rediffmail.com
Dec 7, 8:38:09 PM 0 4126
ECE
the explanation was nice...more of these explanations on other topics would be of much help and is expected urgently...


Posted By :-
 pallavi.sist@gmail.com
Dec 2, 10:32:29 PM 0 4450
e.d.c
i want to simple way abt all the diode n jfet


Posted By :-
 vijayjyani@gmail.com
Jun 4, 10:25:28 AM 1 6012
Thanks for nice tutorials
Thanks for nice tutorials


Posted By :-
 my.gateprep
Nov 26, 8:29:06 AM 0 4042

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