ECSE 330 Introduction to Electronics Ideal Diode
ECSE 330 Introduction to Electronics Lecture 04: Diodes Roni Khazaka
Ideal Diode
R. Khazaka
ECSE330 Introduction to Electronics
2
1
The Ideal Diode +10V 10mA
+10V 0mA
1kΩ
1kΩ
+
+
0V −
10V −
R. Khazaka
ECSE330 Introduction to Electronics
3
The Rectifier Circuit
R. Khazaka
ECSE330 Introduction to Electronics
4
2
Example
R. Khazaka
ECSE330 Introduction to Electronics
5
ECSE330 Introduction to Electronics
6
Example
R. Khazaka
3
Logic Gates: OR and AND
R. Khazaka
ECSE330 Introduction to Electronics
7
i-v Characteristic
R. Khazaka
ECSE330 Introduction to Electronics
8
4
i-v Characterisitic
R. Khazaka
ECSE330 Introduction to Electronics
9
Forward Bias Region
(
In the order of 1
0
−15
)
(strong function of temperature)
i = I s ev vT − 1
Temperature in Kelvin
Boltzman’s constant
vT =
kT q
vT = 0.0862T , mV
The magnitude of the charge of one electron R. Khazaka
ECSE330 Introduction to Electronics
10
5
Temperature Dependence
R. Khazaka
ECSE330 Introduction to Electronics
11
Reverse Bias and Breakdown
Reverse Bias Region
R. Khazaka
i ≅ −I s
ECSE330 Introduction to Electronics
12
6
Analysis (Exponential Model)
I D = I s e vD
vT
vDD − vD ID = R
R. Khazaka
ECSE330 Introduction to Electronics
13
Analysis (Exponential Model)
I D = I s e vD ID = Ise R. Khazaka
vD vT
vDD − vD = R
vT
vDD − vD R
Nonlinear Equation
ECSE330 Introduction to Electronics
14
7
Graphical Analysis
I D = I s e vD
R. Khazaka
vT
ID =
vDD − vD R
ECSE330 Introduction to Electronics
15
Iterative Analysis
vDD = 5V
R = 1kΩ
vT = 26mV
I s = 6.9 × 10 −16 A
Assume
I D = 4.3mA R. Khazaka
⎛I ⎞ vD = vT ln ⎜ D ⎟ ⎝ Is ⎠
vD = 0.7V
vD = 0.7V
I D = I s evD vT v − vD I D = DD R
vDD − vD = 4.3mA R ⎛I ⎞ vD = vT ln ⎜ D ⎟ = 0.766V ⎝ Is ⎠ ID =
ECSE330 Introduction to Electronics
16
8
Iterative Analysis
vD = 0.766V
I D = 4.2mA
R. Khazaka
vDD − vD = 4.2mA R ⎛I ⎞ vD = vT ln ⎜ D ⎟ = 0.7656V ⎝ Is ⎠
ID =
ECSE330 Introduction to Electronics
17
Constant Voltage Drop Model
R. Khazaka
ECSE330 Introduction to Electronics
18
9
Constant Voltage Drop Model +5V i=
i
5 − 0.7 = 4.3mA 1k
1kΩ + 0.7V −
R. Khazaka
ECSE330 Introduction to Electronics
19
ECSE330 Introduction to Electronics
20
Example
R. Khazaka
10
Small Signal Model
vd = rd id
rd =
R. Khazaka
vT ID
ECSE330 Introduction to Electronics
21
Voltage Regulation
R. Khazaka
ECSE330 Introduction to Electronics
22
11
Zener Diode: Reverse Breakdown
ΔV = rz ΔI VZ = VZ 0 + rz I z R. Khazaka
ECSE330 Introduction to Electronics
23
Model For Zener Diode
R. Khazaka
ECSE330 Introduction to Electronics
24
12
Zener Diode as Shunt Regulator
R. Khazaka
ECSE330 Introduction to Electronics
25
Half-Wave Rectifier
R. Khazaka
ECSE330 Introduction to Electronics
26
13
Full-wave Rectifier
R. Khazaka
ECSE330 Introduction to Electronics
27
Bridge Rectifier
R. Khazaka
ECSE330 Introduction to Electronics
28
14
Rectifier with Filter Capacitor
R. Khazaka
ECSE330 Introduction to Electronics
29
Rectifier with Filter Capacitor
R. Khazaka
ECSE330 Introduction to Electronics
30
15
Full wave rectifier with filter
R. Khazaka
ECSE330 Introduction to Electronics
31
Precision Rectifier (Super Diode)
R. Khazaka
ECSE330 Introduction to Electronics
32
16
DC power supply
R. Khazaka
ECSE330 Introduction to Electronics
33
17
Ideal Diode
R. Khazaka
ECSE330 Introduction to Electronics
2
1
The Ideal Diode +10V 10mA
+10V 0mA
1kΩ
1kΩ
+
+
0V −
10V −
R. Khazaka
ECSE330 Introduction to Electronics
3
The Rectifier Circuit
R. Khazaka
ECSE330 Introduction to Electronics
4
2
Example
R. Khazaka
ECSE330 Introduction to Electronics
5
ECSE330 Introduction to Electronics
6
Example
R. Khazaka
3
Logic Gates: OR and AND
R. Khazaka
ECSE330 Introduction to Electronics
7
i-v Characteristic
R. Khazaka
ECSE330 Introduction to Electronics
8
4
i-v Characterisitic
R. Khazaka
ECSE330 Introduction to Electronics
9
Forward Bias Region
(
In the order of 1
0
−15
)
(strong function of temperature)
i = I s ev vT − 1
Temperature in Kelvin
Boltzman’s constant
vT =
kT q
vT = 0.0862T , mV
The magnitude of the charge of one electron R. Khazaka
ECSE330 Introduction to Electronics
10
5
Temperature Dependence
R. Khazaka
ECSE330 Introduction to Electronics
11
Reverse Bias and Breakdown
Reverse Bias Region
R. Khazaka
i ≅ −I s
ECSE330 Introduction to Electronics
12
6
Analysis (Exponential Model)
I D = I s e vD
vT
vDD − vD ID = R
R. Khazaka
ECSE330 Introduction to Electronics
13
Analysis (Exponential Model)
I D = I s e vD ID = Ise R. Khazaka
vD vT
vDD − vD = R
vT
vDD − vD R
Nonlinear Equation
ECSE330 Introduction to Electronics
14
7
Graphical Analysis
I D = I s e vD
R. Khazaka
vT
ID =
vDD − vD R
ECSE330 Introduction to Electronics
15
Iterative Analysis
vDD = 5V
R = 1kΩ
vT = 26mV
I s = 6.9 × 10 −16 A
Assume
I D = 4.3mA R. Khazaka
⎛I ⎞ vD = vT ln ⎜ D ⎟ ⎝ Is ⎠
vD = 0.7V
vD = 0.7V
I D = I s evD vT v − vD I D = DD R
vDD − vD = 4.3mA R ⎛I ⎞ vD = vT ln ⎜ D ⎟ = 0.766V ⎝ Is ⎠ ID =
ECSE330 Introduction to Electronics
16
8
Iterative Analysis
vD = 0.766V
I D = 4.2mA
R. Khazaka
vDD − vD = 4.2mA R ⎛I ⎞ vD = vT ln ⎜ D ⎟ = 0.7656V ⎝ Is ⎠
ID =
ECSE330 Introduction to Electronics
17
Constant Voltage Drop Model
R. Khazaka
ECSE330 Introduction to Electronics
18
9
Constant Voltage Drop Model +5V i=
i
5 − 0.7 = 4.3mA 1k
1kΩ + 0.7V −
R. Khazaka
ECSE330 Introduction to Electronics
19
ECSE330 Introduction to Electronics
20
Example
R. Khazaka
10
Small Signal Model
vd = rd id
rd =
R. Khazaka
vT ID
ECSE330 Introduction to Electronics
21
Voltage Regulation
R. Khazaka
ECSE330 Introduction to Electronics
22
11
Zener Diode: Reverse Breakdown
ΔV = rz ΔI VZ = VZ 0 + rz I z R. Khazaka
ECSE330 Introduction to Electronics
23
Model For Zener Diode
R. Khazaka
ECSE330 Introduction to Electronics
24
12
Zener Diode as Shunt Regulator
R. Khazaka
ECSE330 Introduction to Electronics
25
Half-Wave Rectifier
R. Khazaka
ECSE330 Introduction to Electronics
26
13
Full-wave Rectifier
R. Khazaka
ECSE330 Introduction to Electronics
27
Bridge Rectifier
R. Khazaka
ECSE330 Introduction to Electronics
28
14
Rectifier with Filter Capacitor
R. Khazaka
ECSE330 Introduction to Electronics
29
Rectifier with Filter Capacitor
R. Khazaka
ECSE330 Introduction to Electronics
30
15
Full wave rectifier with filter
R. Khazaka
ECSE330 Introduction to Electronics
31
Precision Rectifier (Super Diode)
R. Khazaka
ECSE330 Introduction to Electronics
32
16
DC power supply
R. Khazaka
ECSE330 Introduction to Electronics
33
17
