pn junction diode
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PN Junction Diode. ENGI 242 ELEC 222. PN Junction Diode. Diode Model Analysis Ideal Approximation Exact Diode Specification Sheets Diode Resistance Static Resistance R D Dynamic Resistance r d Average Resistance r dav Diode Characteristic Curves Simulation. - PowerPoint PPT PresentationTRANSCRIPT
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PN Junction Diode
ENGI 242ELEC 222
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PN Junction Diode• Diode Model Analysis
– Ideal– Approximation– Exact
• Diode Specification Sheets• Diode Resistance
– Static Resistance RD
– Dynamic Resistance rd
– Average Resistance rdav
• Diode Characteristic Curves• Simulation
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Ideal diode: (a) symbol; (b) characteristics.
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Conduction state of the ideal diode based on the applied bias
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Typical Diode Curves
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Forward Bias Curve is Exponential
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Diode Response vs Temperature
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Semiconductor Diode Characteristics
D
K
kV
TD S
D
S
K
I = I (e - 1)
I = Diode Current
I = Reverse Saturation Current
T = Temperature Kelvin
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Determining the dc Resistance
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rd - the Dynamic (ac) Resistance
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Determining rd - the ac Resistance at Q
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Determining rd - the ac Resistance
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rdav – the Average ac Resistance
Draw line through 2 points +VP and -VP
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Circuit to display the V - I characteristics
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PSpice Model Editor – D1N914 Parameters
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DC Sweep Simulation Settings
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PSpice plot of forward bias at 25°C
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DC Sweep Simulation Settings
Note First select Edit Pspice Model, and change IBV to 10
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PSpice generated plot characteristics at 25°C
This Probe output shows both forward and reverse breakdown
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PSpice Netlist Output Part 1
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PSpice Netlist Output Part 2