Diode Bias Analysis in ECE 331 Electronics Principles I - Prof. Hugh R. Grinolds, Study notes of Electrical and Electronics Engineering

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Lecture 5

ECE 331 Electronics Principles IGrinolds FA

Finish Lecture 4 for Diode Models

Diode Bias

Biasing

+ VDD

R

ID

ECE 331 Electronics Principles IGrinolds FA

vD

Diode Bias (cont)

+ 5V

2 kΩ I

• Piecewise Linear:

for r

, look at the characteristicsD

r~ 15D^

aroundv= 0.64VDo^

ECE 331 Electronics Principles IGrinolds FA

vD

Diode Bias

+ 5V

2 kΩ I

• Piecewise Linear:

rD^

Ω, V

= 0.64VDo

I =^

5 – (0.64 + I r

)D

2 k Solve for I

I =^

~ 2.164 mA

ECE 331 Electronics Principles IGrinolds FA

vD

v= 0.64 + I rD^

D Solve for I

I =^

4.36^ 2.015k

~ 2.164 mA

E-3(15)

= 0.64 + 0.033 = 0.673 V

Diode Bias Summary

2.50mA

0.^

2.15mA

2.16mA

Ideal Constant VoltagePiecewise Linear

vD^

ID

• Not much change in I.• The ideal diode is only ECE 331 Electronics Principles IGrinolds FA

2.17mA

Exponential

for very rough circuitbehavior.