Prelims Lecture 2
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
Determine (a) VDQ and IDQ (b) VR
Si
10 V E
R 1k
ID 10
ID(mA)
VD(V) 0.8
Answer
10V
IDQ = 9.25 mA
VDQ = 0.78 V
Q point
Repeat using the simplified equivalent
circuit.
Repeat using the ideal diode equivalent
circuit.
Answers
10V
IDQ = 9.25 mA
VDQ = 0.78 V
Q point Q point
Answers
10V
IDQ = 10 mA
VDQ = 0.78 V
Q point
VDQ = 0V
Forward Bias
Reverse Bias
Determine (a) VD (b) ID (c) VR
Si
8 V E
R 2.2k
ID
Determine (a) VD (b) ID (c) VR
Si
8 V E
R 2.2k
ID
Determine (a) VD (b) ID (c) VR
Si
0.5 V E
R 1.2 k
ID
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
Determine ID, VD2 and VO.
Determine I, V1, V2 and VO.
I
+ V1 -
+
V2
-
Determine I1, ID1, ID2 and VO
Determine the current I in the circuit.
R
2.2 k
E1=20V E2=4V
I
Si
Si
D1
D2
Determine the voltage VO. 12 V
Vo
R
2.2 k
Si Ge
Determine I1, I2 and ID2.
R1
3.3 k
R2
5.6 k
I1
I2 ID2
E = 20V
Si
Si
D1
D2
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.
2. Determine Vo and ID.
3. Determine VO and ID.
4. Determine VO1, VO2 and I.
Prepare for a long quiz next meeting
Read and study your reference book and
dont just rely on the power point presentation.
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