diode dc circuits
DESCRIPTION
Lecture about DiodeTRANSCRIPT
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Prelims Lecture 2
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Load-line plots all the possible combinations of the diode current ID and voltage VD for a given circuit
Q-point the point where the load line and the characteristic curve intersect
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Determine (a) VDQ and IDQ (b) VR
Si
10 V E
R 1k
ID 10
ID(mA)
VD(V) 0.8
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Answer
10V
IDQ = 9.25 mA
VDQ = 0.78 V
Q point
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Repeat using the simplified equivalent
circuit.
Repeat using the ideal diode equivalent
circuit.
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Answers
10V
IDQ = 9.25 mA
VDQ = 0.78 V
Q point Q point
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Answers
10V
IDQ = 10 mA
VDQ = 0.78 V
Q point
VDQ = 0V
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Forward Bias
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Reverse Bias
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Determine (a) VD (b) ID (c) VR
Si
8 V E
R 2.2k
ID
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Determine (a) VD (b) ID (c) VR
Si
8 V E
R 2.2k
ID
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Determine (a) VD (b) ID (c) VR
Si
0.5 V E
R 1.2 k
ID
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Determine VO and ID.
12 V Vo
Si red R
680
Color Constructi
on
Typical
Voltage
(V)
Amber AlInGaP 2.1
Blue GaN 5.0
Green GaP 2.2
Orange GaAsP 2.0
Red GaAsP 1.8
White GaN 4.1
Yellow AlinGaP 2.1
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Determine ID, VD2 and VO.
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Determine I, V1, V2 and VO.
I
+ V1 -
+
V2
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Determine I1, ID1, ID2 and VO
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Determine the current I in the circuit.
R
2.2 k
E1=20V E2=4V
I
Si
Si
D1
D2
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Determine the voltage VO. 12 V
Vo
R
2.2 k
Si Ge
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Determine I1, I2 and ID2.
R1
3.3 k
R2
5.6 k
I1
I2 ID2
E = 20V
Si
Si
D1
D2
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1.(a) Using the characteristics shown on the
next slide. Determine ID, VD, and VR for the
given circuit. (b) repeat part a using the
approximate model (c) repeat part a using
the ideal diode model.
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2. Determine Vo and ID.
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3. Determine VO and ID.
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4. Determine VO1, VO2 and I.
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Prepare for a long quiz next meeting
Read and study your reference book and
dont just rely on the power point presentation.