A semiconductor, therefore, is a material that has a conductivity level somewhere between the extremes of an insulator and a conductor. Although you may be familiar with the electrical properties of copper and. It will appear in a range of applications,extending from the simple to the very complex. It is the simplest of semiconductor devices but plays a very vital role in electronic systems,having characteristics that closely match those of a simple switch. If a reverse voltage is applied,the characteristics to the left are pertinent.Īs indicated earlier,the primary purpose of this section is to introduce the characteristics of an ideal device for comparison with the characteristics of the commercial variety. Our sincerest appreciation must be extended to the instructors who have used the text and sent in comments, corrections, and suggestions. The units of -cm are derived from the substitution of the units for each quantity of Fig. The ideal diodeis a two-terminaldevice having the symbol and characteristics shown in Figs. Ideally,a diode will conduct current in the direction defined by the arrow in the symbol and act like an open circuit to any attempt to establish current in the opposite direction.
That is,the higher the conductivity level,the lower the resistance level. The miniaturization that has resulted leaves us to wonder about its limits. The characteristics of an ideal diode are those of a switch that can conduct current in elstronica one direction. Complete systems now appear on wafers thousands of times smaller than the single element of earlier networks. In tables,the term resistivity ,Greek letter rho is often used when comparing the resistance levels of materials. Miniaturization appears to be limited by three factors each of analogia will be addressed in this text: Consider the region of negatively applied potential third quadrant of Fig. In anwlogica years the shift has been steadily toward silicon and away from germanium,but germanium is still in modest production. This fact will be helpful to remember as we compare resistivity levels in the discussions to follow. In general,it is relatively simple to determine whether a diode is in the region of conduction or nonconduction simply by noting the direction of the current IDestablished by an applied voltage. It refers to any device or system that has ideal characteristics-perfect in every way. In metric units,the resistivity of a material is measured in -cm or -m. The first edition of this text contained heavy coverage of tubes,with succeeding editions involving the important decision of how much coverage should be dedicated to tubes and how much to semiconductor devices. Conductor Semiconductor Insulator mica from your past studies,the characteristics of the semiconductor materials of germanium Ge and silicon Si may be relatively new. An insulator is a material that offers a very low level of conductivity under pressure from an applied voltage source. Veja grátis o arquivo Eletrônica Analógica enviado para a disciplina de Física II Categoria: Trabalhos – 28 – Veja grátis o arquivo Eletrônica Analógica enviado para a disciplina de Física II Categoria: Trabalhos – 4 –Īs we progress through the next few sections,keep the following questions in mind. Professor: Ivanildo Antonio da Silva Junior Introdução Eletrônica. Eletrônica Analógica Aula Teste: Instrumentos de medição eletro-eletrônicos.
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