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vb.net barcode reader source code Figure 828 Comments: Once again, the offset diode model permits using the same analysis method in Software
Figure 828 Comments: Once again, the offset diode model permits using the same analysis method QR Scanner In None Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications. QR Code Creation In None Using Barcode maker for Software Control to generate, create QR Code ISO/IEC18004 image in Software applications. that was developed for the ideal diode model
QR Code Reader In None Using Barcode reader for Software Control to read, scan read, scan image in Software applications. Printing QR Code JIS X 0510 In Visual C#.NET Using Barcode encoder for Visual Studio .NET Control to generate, create QRCode image in .NET framework applications. SmallSignal Diode Models As one examines the diode iv characteristic more closely, it becomes apparent that the shortcircuit approximation is not adequate to represent the smallsignal behavior of the diode The term smallsignal behavior usually signi es the response of the diode to small timevarying signals that may be superimposed on the average diode current and voltage Figure 88 depicts a closeup view of a silicon QR Printer In .NET Framework Using Barcode printer for ASP.NET Control to generate, create QR Code image in ASP.NET applications. QR Code ISO/IEC18004 Drawer In Visual Studio .NET Using Barcode drawer for .NET framework Control to generate, create QR image in Visual Studio .NET applications. 8
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Bar Code Creation In None Using Barcode generation for Software Control to generate, create barcode image in Software applications. Code 39 Extended Generator In None Using Barcode maker for Software Control to generate, create Code 39 Extended image in Software applications. diode iv curve From this gure, it should be apparent that the shortcircuit approximation is not very accurate when a diode s behavior is viewed on an expanded scale To a rstorder approximation, however, the iv characteristic resembles that of a resistor (ie, is linear) for voltages greater than the offset voltage Thus, it may be reasonable to model the diode as a resistor (instead of a short circuit) once it is conducting, to account for the slope of its iv curve In the following discussion, the method of loadline analysis (which was introduced in 3) will be exploited to determine the smallsignal resistance of a diode Consider the circuit of Figure 829, which represents the Th venin equivalent e circuit of an arbitrary linear resistive circuit connected to a diode Equations 813 and 814 describe the operation of the circuit: vT = iD RT + vD arises from application of KVL, and iD = I0 (eqvD /kT 1) (814) (813) Barcode Generator In None Using Barcode creator for Software Control to generate, create barcode image in Software applications. Create Data Matrix In None Using Barcode creation for Software Control to generate, create ECC200 image in Software applications. is the diode equation (86) Although we have two equations in two unknowns, these cannot be solved analytically, since one of the equations contains vD in exponential form As discussed in 3, two methods exist for the solution of transcendental equations of this type: graphical and numerical In the present case, only the graphical solution shall be considered The graphical solution is best understood if we associate a curve in the iD vD plane with each of the two preceding equations The diode equation gives rise to the familiar curve of Figure 88 The loadline equation, obtained by KVL, is the equation of a line with slope 1/R and ordinate intercept given by VT /RT iD = 1 1 vD + VT RT RT Load line equation (815) Creating C 2 Of 5 In None Using Barcode encoder for Software Control to generate, create Code 2 of 5 image in Software applications. Make Barcode In .NET Using Barcode printer for Reporting Service Control to generate, create barcode image in Reporting Service applications. The superposition of these two curves gives rise to the plot of Figure 830, where the solution to the two equations is graphically found to be the pair of values (IQ , VQ ) The intersection of the two curves is called the quiescent (operating) point, or Q point The voltage vD = VQ and the current iD = IQ are the actual diode voltage and current when the diode is connected as in the circuit of Figure 829 Note that this method is also useful for circuits containing a larger number of elements, provided that we can represent these circuits by their Th venin equivalents, with e the diode appearing as the load Linear Generation In C# Using Barcode drawer for .NET Control to generate, create 1D Barcode image in Visual Studio .NET applications. Decoding UPC A In Visual C# Using Barcode recognizer for VS .NET Control to read, scan read, scan image in .NET applications. RT + vD _ iD VT RT
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Draw ANSI/AIM Code 39 In Java Using Barcode generator for Java Control to generate, create ANSI/AIM Code 39 image in Java applications. Creating Code128 In None Using Barcode creation for Online Control to generate, create Code128 image in Online applications. Q point (IQ, VQ) Figure 829 Diode circuit for illustration of loadline analysis
VT vD
Figure 830 Graphical solution of equations 813 and 814
Part II
Electronics
F O C U S O N M E T H O D O L O G Y
Determining the Operating Point of a Diode 1 Reduce the circuit to a Th venin or Norton equivalent circuit with the e diode as the load 2 Write the load line equation (815) 3 Solve numerically two simultaneous equations in two unknowns (the load line equations and the diode equation) for the diode current and voltage Or 4 Solve graphically by nding the intersection of the diode curve (eg, from a data sheet) with the load line curve The intersection of the two curves is the diode operating point F O C U S O N M E T H O D O L O G Y
Using Device Data Sheets One of the most important design tools available to engineers is the device data sheet In this box we illustrate the use of a device data sheet for the 1N400X diode This is a generalpurpose recti er diode, designed to conduct average currents in the 10A range Excerpts from the data sheet are shown below, with some words of explanation The complete data sheets can be found in the accompanying CDROM

