Diode Characteristic and Biasing

7/29/2019 Diode Characteristic and Biasing

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College of Engineering

Ateneo de Naga University

Activity 1

Diode Characteristic and Biasing

Name: Romelyn P. Perez Date Performed: _April 12, 2012_Section: GEN1______ Date Submitted:

Name of Laboratory Partner: _Nikko Alexis C. Peralta______

Laboratory Instructor: _Engr. Anacleto Casimiro___

RESULTS AND ANALYSIS

Table 1 Diode Specification

Product Number: IN4001

Continuous Forward Current: 30APeak Inverse Voltage: 50V

Table 2 Diode Curve

Supply Voltage Diode Voltage Diode and Resistor

Current

Resistor Voltage

0V 0 0 0

0.1V 99.812mV 0 00.2V 198.546mV 0.001471mA 1.454mV

0.3V 291.136mV 0.008882mA 8.864mV

0.4V 363.792mV 0.036304mA 36.208mV

0.5V 410.551mV 0.089484mA 89.449mV

0.6V 440.473mV 0.15965mA 159.527mV

0.7V 461.316mV 0.238698mA 238.684mV

0.8V 476.971mV 0.323186mA 323.029mV

0.9V 489.384mV 0.410671mA 410.616mV

1V 499.615mV 0.500489mA 500.385mV

1.5V 533.677mV 0.96656mA 966.323mV2V 554.527mV 1.446mA 1.445mV

2.5V 569.515mV 1.931mA 1930mV

3V 581.2mV 2.419mA 2419mV


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Table 2 Diode Curve

OBSERVATION AND ANALYSIS:

Yes, the values remain constant for the diode and transistor. As shown at the graph above, we

observed that when the diode voltage is increasing, the diode and resistor current is also increasing

Therefore, the relationship of the Diode and Resistor Current and Diode voltage is directly proportional.

0

0.5

1

1.5

2

2.5

3

V-i plotCurrent (mA)

Diode Voltage (mV)


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OBSERVATION AND ANALYSIS:

As shown at the graph above, we observed that when the resistor voltage is increasing, the diode and

resistor current is also increasing. Therefore, the relationship of the Diode and Resistor Current and Resistor

voltage is directly proportional.

Table 3 Diode Circuit

VAB States of Diode Diode Voltage Diode Current Bias Condition

Fig. 2 5.02 V On 0.7 V 4.39mA Forward

Fig. 3 5.02 V Off 5.02V 0 Reverse

Fig. 4 -3 V Off -3 V 0 Reverse

Fig. 5 - 1 V Off - 0.535 V 0 reverse

Fig. 6 -1 V Off -1V 0 Reverse

Fig. 7 1.5V On 567.715mV 1.865mA Forward

0

0.5

1

1.5

2

2.5

3

V-i plotCurrent (mA)

Resistor Voltage (mV)


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Follow-Up Activity

Table 4

Faults VO condition (in terms of VCC)

1. NormalCondition

VO = 2VDC + D2 - 3D1

4

2. R3 short VO = 2VDC + R14

3. R3 open VO = 2VDC + R12D1R12 R1

4. R2 short VO = 2VDC + D12D1R12 R1

5. R2 open VO = VDC VR1 D16. R1 short VO = VDC D17. R1 opens VO = 08. D1 open VO = 09. D2 open VO = VDC VR1 D1

OBSERVATION:

As we observed in the Table 3, when the state of diode is ON, the bias condition of the diode is forward

and there will be current flowing through the diode. But when the state of diode is OFF, the bias condition of

the diode is reverse, so the current that flows into the diode is equal to 0 A. In case of two voltage sources the

state of diode is depend on the higher voltage, so the bias of the diode can be forward or reverse depend tothe polarity of the higher voltage source.

Generalization:

In this activity entitled Diode Characteristic and Biasing, aside from we improve our skill and knowledge

in analyzing circuit, I learned and verify the function of a diode in a circuit, and also the importance of knowing

the state of diode, because when the state of diode is on, its bias condition is forward and there will be

currents across. While, when the state of diode is off, the current across is equal to 0 A. And also the

relationship of the voltage and current in a series circuit is directly proportional, when the voltage increases,

the current also increases.


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Pre-Lab

Measuring the Diode Voltage: Measuring the Diode and Resistor Current:

V1

2.5 V

R1

1k

D1

1N4001

XMM1

V1

2.5 V

R1

1k

D1

1N4001XMM1

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Diode Characteristic and Biasing