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Electronics
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iD Reverse breakdown region
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Reverse bias region
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Forward bias region V vD + vD _ iD
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Complete i-v curve of a semiconductor diode
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Figure 810 i-v characteristic of semiconductor diode
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acts nearly as a short circuit, readily conducting current When vD is between V and the Zener breakdown voltage, VZ , the diode acts very much like an open circuit, conducting a small reverse current, I0 , of the order of only nanoamperes (nA) Finally, if the voltage vD is more negative than the Zener voltage, VZ , the diode conducts again, this time in the reverse direction
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CIRCUIT MODELS FOR THE SEMICONDUCTOR DIODE
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From the viewpoint of a user of electronic circuits (as opposed to a designer), it is often suf cient to characterize a device in terms of its i-v characteristic, using either load-line analysis or appropriate circuit models to determine the operating currents and voltages This section shows how it is possible to use the i-v characteristics of the semiconductor diode to construct simple yet useful circuit models Depending on the desired level of detail, it is possible to construct large-signal models of the diode, which describe the gross behavior of the device in the presence of relatively large voltages and currents; or small-signal models, which are capable of describing the behavior of the diode in ner detail and, in particular, the response of the diode to small changes in the average diode voltage and current From the user s standpoint, these circuit models greatly simplify the analysis of diode circuits and make it possible to effectively analyze relatively dif cult circuits simply by using the familiar circuit analysis tools of 3 The rst two major divisions of this section will describe different diode models and the assumptions under which they are obtained, to provide the knowledge you will need to select and use the appropriate model for a given application
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Large-Signal Diode Models
Ideal Diode Model
Our rst large-signal model treats the diode as a simple on-off device (much like a check valve in hydraulic circuits see box, Hydraulic Check Valves )
8
Semiconductors and Diodes
Hydraulic Check Valves To understand the operation of the semiconductor diode intuitively, we make reference to a very common hydraulic device that nds application whenever one wishes to restrict the ow of a uid to a single direction, and prevent (check) reverse ow Hydraulic check valves perform this task in a number of ways We illustrate a few examples in this box Figure 1 depicts a swing check valve In this design, ow from left to right is permitted, as the greater uid pressure on the right side of the valve forces the swing door to open If ow were to reverse, the reversal of uid pressure (greater pressure on the right) would cause the swing door to shut Figure 2 depicts a apper check valve The principle is similar to that described above for the swing check valve In Figure 2, uid ow is permitted from left to right, and not in the reverse direction The response of the valve of Figure 2 is faster (due to the shorter travel distance of the apper) than that of Figure 1 You will nd the analysis of the diode circuits in this chapter much easier to understand intuitively if you visualize the behavior of the diode to be similar to that of the check valves shown here, with the pressure difference across the valve ori ce being analogous to the voltage across the diode, and the uid ow rate being analogous to the current through the diode Figure 3 depicts the diode circuit symbol Current ows only from left to right whenever the voltage across the diode is positive, and no current ows when the diode voltage is reversed The circuit element of Figure 3 is functionally analogous to the two check valves of Figures 1 and 2
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