Lecture_3_diode

Lecture_3_diode - Diodes Hao Jiang Assistant Professor of...

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Hao Jiang Assistant Professor of Electrical Engineering School of Engineering San Francisco State University Diodes
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2 Introduction of Microelectronics Diode DC 2 1 IS kT qV D D e I Shockley Current
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3 Introduction of Microelectronics PN junction (diode) When p and n doped region is put side by side in a semiconductor, a PN junction or a diode is formed. 3
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4 Introduction of Microelectronics In an “IC” form Most diodes are made during the CMOS process. 4 P ground N ground
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5 Introduction of Microelectronics Diode’s 3 operation regions In order to understand the operation of a diode, it is necessary to study its three operation regions: equilibrium, reverse bias, and forward bias. 5
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6 Introduction of Microelectronics Depletion Region As free electrons and holes diffuse across the junction, a region of fixed ions is left behind. This region is known as the “depletion region.” 0 0 n D p A x qN x qN
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7 Introduction of Microelectronics Diode in Reverse Bias When the N-type region of a diode is connected to a higher potential than the P-type region, the diode is under reverse bias, which results in wider depletion region and larger built-in electric field across the junction.
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8 Introduction of Microelectronics Reverse Biased Diode’s Application: Voltage-Dependent Capacitor The PN junction can be viewed as a capacitor. By varying V R , the depletion width changes, changing its capacitance value; therefore, the PN junction is actually a voltage- dependent capacitor.
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Lecture_3_diode - Diodes Hao Jiang Assistant Professor of...

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