1 . 1 Explain the detection process in a pn diode. ( 4 ) 1 . 2 A pn photodiode has a quantum efficiency of 6 4 % for photons of energy 1 . 5 2 × 1 0 - 1 9 � . Calculate the wavelength at which the diode is operating and also the optical power required to achieve a photocurrent of 3 � � at the calculated wavelength. ( 6 ) 1 . 3 A square Si PIN photodiode ( 1 1 0 � � × 1 1 0 � � with a specific detectivity of 4 × 1 0 1 0 � � � 1 2 � operates at a wavelength of 1 5 5 0 nm . The quantum efficiency is 6 0 % . Assume that the dominant noise source is due to dark current noise. 1 . 3 . 1 Calculate the magnitude of the dark current in a 1 Hz bandwidth. ( 6 ) 1 . 3 . 2 Determine the photocurrent. 1 . 3 . 3 Calculate the smallest detectable signal power at this wavelength when the signal bandwidth is 2 5 kHz . ( 4 ) [ 2 4 ]
1 . 1 Explain the detection process in a pn diode. ( 4 ) 1 . 2 A pn photodiode has a quantum efficiency of 6 4 % for photons of energy 1 . 5 2 × 1 0 - 1 9 � . Calculate the wavelength at which the diode is operating and also the optical power required to achieve a photocurrent of 3 � � at the calculated wavelength. ( 6 ) 1 . 3 A square Si PIN photodiode ( 1 1 0 � � × 1 1 0 � � with a specific detectivity of 4 × 1 0 1 0 � � � 1 2 � operates at a wavelength of 1 5 5 0 nm . The quantum efficiency is 6 0 % . Assume that the dominant noise source is due to dark current noise. 1 . 3 . 1 Calculate the magnitude of the dark current in a 1 Hz bandwidth. ( 6 ) 1 . 3 . 2 Determine the photocurrent. 1 . 3 . 3 Calculate the smallest detectable signal power at this wavelength when the signal bandwidth is 2 5 kHz . ( 4 ) [ 2 4 ]
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
Related questions
Question
1
.
1
Explain the detection process in a pn diode.
(
4
)
1
.
2
A pn photodiode has a quantum efficiency of
6
4
%
for photons of energy
1
.
5
2
×
1
0
-
1
9
�
.
Calculate the wavelength at which the diode is operating and also the optical power required to achieve a photocurrent of
3
�
�
at the calculated wavelength.
(
6
)
1
.
3
A square Si PIN photodiode
(
1
1
0
�
�
×
1
1
0
�
�
with a specific detectivity of
4
×
1
0
1
0
�
�
�
1
2
�
operates at a wavelength of
1
5
5
0
nm
.
The quantum efficiency is
6
0
%
.
Assume that the dominant noise source is due to dark current noise.
1
.
3
.
1
Calculate the magnitude of the dark current in a
1
Hz bandwidth.
(
6
)
1
.
3
.
2
Determine the photocurrent.
1
.
3
.
3
Calculate the smallest detectable signal power at this wavelength when the signal bandwidth is
2
5
kHz
.
(
4
)
[
2
4
]
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