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1. Imtaiyazul Haque, Haque Mobassir Imtiyaz, Niyaz Ahmed Abdul Mateen Khan, Veena
Narayankar / International Journal of Engineering Research and Applications (IJERA) ISSN:
2248-9622 www.ijera.com Vol. 2, Issue 5, September- October 2012, pp.861-864
DIODE: - UNIQUE BEHAVIOUR DOCUMENTATION ON IN4007 DIODE
IMTAIYAZUL HAQUE & HAQUE MOBASSIR IMTIYAZ & NIYAZ
AHMED ABDUL MATEEN KHAN & VEENA NARAYANKAR
department of electronics engineering m.h.s.s institution of engg.and technology.
ABSTRACT
In this study of ours we have noted few typical
behavior of diode which is inconsistence with the
commonly known behavior
KEYWORDS: biasing, frequency, voltage follower,
barrier potential,amplifier,unity gain follower
DIODE IN4007
THEORY
In normal biasing state of diode anode
terminal is connected to positive of the power
source and cathode is connected to ground. When
anode voltage crosses inner barrier potential of
diode the device goes into conduction state where
there is increase in output current with constant Vak
(voltage across anode and cathode) voltage. But in
this paper we have observed the behavior of diode at
different biasing conditions
In this we are keeping anode voltage at
0.5v and cathode at 0v and we come across the
following relation of current and resistance.
Resistance is in mega ohm and current s in milli
amperes.
BIASING
6
ANODE VOLTAGE VA IS AT HIGHER POTENTIAL
5
va
THAN CATHODE VOLTAGE VK 4
vk
3
I (in ma)
2
R(MEGA)
1
0
1 2 3 4 5 6 7 8 9
In above observation we can see that
inspite of constant d.c. bias the resistance and
current both forming a valley much similar to a
sinusoid waves. Resistance is varying between
highest peak of 5.58 and lowest peak of 1.8. the
current in most pronouncing form forming a sino-
soid valley varying in highest peak of 1.5 and lowest
peak of 0.6.
Anode voltage va = 2v & cathode voltage vk = 0v
861 | P a g e

2. Imtaiyazul Haque, Haque Mobassir Imtiyaz, Niyaz Ahmed Abdul Mateen Khan, Veena
Narayankar / International Journal of Engineering Research and Applications (IJERA) ISSN:
2248-9622 www.ijera.com Vol. 2, Issue 5, September- October 2012, pp.861-864
3.5 0/2.9
80
60
40 3.5 0/2.9
20
0
I (in ma) R(MEGA)
In the above three reading though we kept
cathode voltage at zero but with increase in anode
voltage the cathode voltage followed the anode
voltage with a difference of 0.7 va = 2v then vk =
1.4v,va = 2.5v then vk = 1.8v, va = 3.5v then vk =
2.9v, and the resistance is constant at 4.7 m
ohm,4.68 mohm and 4.68 ohm but with increase in
anode voltage the current reduces in the sequence
74.3ma,74ma,73.5ma,73.3ma. it means the current
and resistance behaviour in independent of their
change
ANODE VOLTAGE VA AND CATHODE
VOLTAGE VK IS AT SAME POTENTIAL
anode voltage va = 0.5v cathode voltage vk = 0.5v
2 0/1.4
90
80
80
70
60 60 va
50 vk
40 2 0/1.4
40 I (in ma)
20 30 R(MEGA)
0 20
I (in ma) R(MEGA) 10
0
Anode voltage va = 2.5v & cathode voltage vk = 1 3 5 7 9 11 13 15
0v
When we are keeping anode and cathode
2.5 0/1.8 both at 0.5voltsvaries from 1.13 to high valley of
4.72 and then reduces to sinusoid nature with high
80 peak of 3 to to lowest peak of 0.05. similarly current
starts from 76.7ma then sudden drop 0.9ma and the
60 sinusoidal varying with highest peak of 75.8ma and
lowest peak of 73.9ma
40 2.5 0/1.8
anode voltage va = 2v cathode voltage vk = 2v
20
0
I (in ma) R(MEGA)
Anode voltage va = 3.5v & cathode voltage vk =
0v
862 | P a g e

3. Imtaiyazul Haque, Haque Mobassir Imtiyaz, Niyaz Ahmed Abdul Mateen Khan, Veena
Narayankar / International Journal of Engineering Research and Applications (IJERA) ISSN:
2248-9622 www.ijera.com Vol. 2, Issue 5, September- October 2012, pp.861-864
anode voltage va = 16v cathode voltage vk = 16v
anode voltage va = 22v cathode voltage vk = 22v
180
160
140
120
When we are varying the anode and cathode from
100
3volt to 22volt the current is near about constant
80 va DIODE AS UNITY GAIN FOLLOWER OR
60 vk AMPLIFIER?
40 I (in ma)
20 R(MEGA)
0
1 5 9 13 17 21 25
When we are keeping anode and cathode
both at 1volts current starts at 11.38 and sinusoidly
varies from highest peak of 154.5 to lowest peak of
106, and the resistance is near about constant with
slight variation
anode voltage va = 3v cathode voltage vk = 3v
anode voltage va = 4v cathode voltage vk = 4v diode as amplifier
863 | P a g e

4. Imtaiyazul Haque, Haque Mobassir Imtiyaz, Niyaz Ahmed Abdul Mateen Khan, Veena
Narayankar / International Journal of Engineering Research and Applications (IJERA) ISSN:
2248-9622 www.ijera.com Vol. 2, Issue 5, September- October 2012, pp.861-864
CONCLUSION:
on the basis of above observations we can
say that on practical analysis diode is much more
than a switch or for the matter rectyifier . we have
seen the sinusoid variations of current and
resistances, which is independent of each other. We
have seen diode behaving as amplifier with albiet
low gain.we are carrying out further studies to put
the above behaviour interms of mathmetical/solid
state devices equation. This may leads to complete
new out look toward a conventional diode and new
applicaions will come in picture
diode as amplifier
Diode as unity gain follower
864 | P a g e