CH09 - Semiconductors and Diodes

CH09 - Semiconductors and Diodes - G. Rizzoni, Principles...

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G. Rizzoni, Principles and Applications of Electrical Engineering Problem solutions, Chapter 9 9 . 1 Chapter 9 Instructor Notes After a brief introduction to semiconductors materials in Section 9.1, Section 9.2 introduces the pn junction and the semiconductor diode equation and i-v curves. These sections could be bypassed in favor of a more intuitive presentation, provided in Section 9.3 with an explanation of the basic circuit behavior of the diode, beginning with large-signal models. This explanation is supplemented by the sidebar Make the Connection: Hydraulic Check Valves (pp. 466-467), which continues the electric-hydraulic analogy introduced in earlier chapters, and provides an intuitive explanation of the operation of the semiconductor diodes 1. The box Focus on Methodology: Determining the Conduction State of a Diode (p. 467) helps the student understand how diode state of conduction can be determined. The large-signal circuit model material is probably sufficient for the purposes of most introductory courses. 5nstructors who are interested in introducing the subject of small-signal models, in preparation for a the study of transistor small-signal amplifiers, may find the rest of the section, covering small-signal diode models (pp. 474-483), of interest. The concept of operating point is introduced, with a review of the load-line equation and the definition of the quiescent operating point of a device. The box Focus on Methodology: Determining the Operating Point of a Diode (p. 475) summarizes this material. Section 3.8 can be recalled (or introduced for the first time) at this point. The solution methods used in Examples 9.5, 9.6, 9.7 emphasize the use of simple circuit models for the diode, together with the use of Thèvenin equivalent circuits; this method is quite general, and will reinforce the importance (and understanding) of the concept of equivalent circuits in analyzing more advanced circuits. The use of Device Data Sheets is continued in this chapter with a summary data sheet on a general purpose diode. The box Focus on Methodology: Using device data sheets (pp. 476-477) is designed to familiarize the student with the basic contents and function of device data sheets. The instructor may wish to expand on this introductory presentation by asking students to locate data sheets in the accompanying CD-ROM or on the web, and to identify specific devices and their parameters for use in homework problems. Section 9.4 discusses various diode rectifier circuits; Section 9.5 introduces DC power supplies; Zener diode circuits and voltage regulation. Section 9.6 analyzes various signal processing circuits, and introduces two application examples in the boxes Focus on Measurements: Peak Detector Circuit for Capacitive Displacement Transducer (pp. 499-501), which is tied to two earlier boxeson the capacitive displacement transducer (pp. 147-148 and pp. 175-177), and Focus on Measurements: Diode Thermometer (pp. 502-503). The latter example can be tied to a laboratory experiment 2.
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This note was uploaded on 04/08/2009 for the course ELE ELE1403 taught by Professor Khaled during the Spring '09 term at NYU Poly.

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CH09 - Semiconductors and Diodes - G. Rizzoni, Principles...

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