 Home
 Products
 Integration
 Tutorial
 Barcode FAQ
 Purchase
 Company
qr code vb.net free * See note 21 in Appendix. in .NET framework
* See note 21 in Appendix. Recognize Code 128C In .NET Framework Using Barcode Control SDK for VS .NET Control to generate, create, read, scan barcode image in .NET framework applications. Code 128A Creation In .NET Using Barcode creation for .NET Control to generate, create USS Code 128 image in VS .NET applications. Vi R jXC
Code128 Reader In VS .NET Using Barcode decoder for VS .NET Control to read, scan read, scan image in .NET framework applications. Barcode Printer In .NET Using Barcode creation for .NET Control to generate, create barcode image in .NET applications. CHAPTER 9 Impedance Transformation
Barcode Reader In Visual Studio .NET Using Barcode reader for VS .NET Control to read, scan read, scan image in .NET applications. Code 128 Generator In Visual C#.NET Using Barcode printer for Visual Studio .NET Control to generate, create Code 128B image in .NET framework applications. thus, again by Ohm s law, V jXC " " Vo I jXC i R jXC
Create Code 128B In VS .NET Using Barcode drawer for ASP.NET Control to generate, create Code128 image in ASP.NET applications. Encode ANSI/AIM Code 128 In Visual Basic .NET Using Barcode maker for .NET framework Control to generate, create ANSI/AIM Code 128 image in .NET applications. j 1 , you should nd Now, dividing both sides by Vi and noting that jXC !C j!C that " G 1 1 j!RC 316 UPC  13 Maker In Visual Studio .NET Using Barcode generation for VS .NET Control to generate, create EAN / UCC  13 image in VS .NET applications. Barcode Encoder In Visual Studio .NET Using Barcode creation for .NET framework Control to generate, create bar code image in .NET applications. " where G is the SINUSOIDAL STEADYSTATE VOLTAGE GAIN of the basic RC lowpass lter of Fig. 190, where ! is any frequency in radians per second (! 2f ). In eq. (316), let us regard the product RC as having a constant value in any given case, with the variable being the frequency !. We now wish to develop certain important " relationships that exist between G and !. This can be done in an interesting way algebraically, as follows. Let us begin by creating, by de nition, the equation RC 1=!1 317 Drawing Code 128 In .NET Using Barcode generator for .NET Control to generate, create Code 128 Code Set B image in Visual Studio .NET applications. Painting USD  8 In .NET Framework Using Barcode generation for VS .NET Control to generate, create USD8 image in .NET applications. where, since RC is constant, the frequency !1 is also constant. It is permissible to write such an equation, because the unit of measurement for both RC and 1=! is seconds (eq. (91) in Chap. 5, and note 14 in the Appendix). Thus, replacing RC with the righthand side of eq. (317), eq. (316) becomes " G 1 1 j !=!1 318 Make Bar Code In Java Using Barcode creation for BIRT reports Control to generate, create bar code image in BIRT reports applications. EAN 13 Printer In C#.NET Using Barcode encoder for Visual Studio .NET Control to generate, create EAN13 image in VS .NET applications. The advantage of eq. (318) over (316) is that we no longer have to work with actual absolute values of ! (such as ! 508 rad/sec or ! 10,750 rad/sec, and so on), but only with the simple ratio of ! to !1 ; the frequency is now said to be normalized with respect to the reference frequency !1 . Eq. (318) contains all the information, concerning both the amplitude and phase response, of the network of Fig. 190. Let us rst investigate the amplitude response, as follows. The AMPLITUDE response is determined by the MAGNITUDE of eq. (318); thus the amplitude response of Fig. 190 is equal to 1 " jGj q 1 !=!1 2 1=2 1 !=!1 2 319 Printing Code 39 Extended In Java Using Barcode drawer for Java Control to generate, create Code39 image in Java applications. DataMatrix Drawer In None Using Barcode encoder for Font Control to generate, create Data Matrix ECC200 image in Font applications. " Now, as noted in note 19 in the Appendix, because G is a voltage ratio, the decibel relationship would be written " dB 20 log jGj 2D Barcode Generator In Visual Studio .NET Using Barcode drawer for ASP.NET Control to generate, create 2D Barcode image in ASP.NET applications. UPCA Encoder In None Using Barcode creation for Software Control to generate, create GTIN  12 image in Software applications. 320 Make EAN13 In None Using Barcode encoder for Microsoft Excel Control to generate, create EAN 13 image in Microsoft Excel applications. Printing ECC200 In Java Using Barcode encoder for Java Control to generate, create Data Matrix 2d barcode image in Java applications. " and thus, using the value of jGj from eq. (319) and remembering that log A n log A, eq. (320) gives the value dB 10 log 1 !=!1 2 321 The minus sign appears because the voltage gain in Fig. 190 is less than 1 for all values of ! greater than zero, and the logarithm of a number less than 1 is negative. The procedure now is to plot eq. (321) on semilog paper, putting decibel gain on the linear vertical axis and the frequency ratio !=!1 on the logarithmic horizontal axis. CHAPTER 9 Impedance Transformation
To draw the curve, we rst calculate a table of values of decibel gain for various values of the independent variable !=!1 . Thus, the following table was obtained by using eq. (321) to calculate dB gain for each of the following given values of !=!1 . !=!1 0.2 0.4 0.6 0.8 1.0 !=!1 2.0 4.0 6.0 8.0 !=!1 10 20 30 40 50 dB gain 0.17 0.65 1.34 2.15 3.01
dB gain 6.99 12.31 15.68 18.13
dB gain 20.04 26.03 29.55 32.04 33.98
Plotting decibel gain versus frequency ratio, we get the curve shown in Fig. 191.
Fig. 191
Remember that negative decibel gain means signal attenuation; that is, the output voltage is less than the input voltage. Figure 191 shows that Fig. 190 is a lowpass network, because the higher the frequency !, the greater is the attenuation of the output signal relative to the constant amplitude input signal. This is an appropriate time to introduce another term, called the HALFPOWER frequency, that is widely used in the evaluation of the frequency response of networks and systems. The de nition is as follows. A halfpower frequency is a frequency at which the OUTPUT POWER of a network is reduced to ONE HALF its maximum value under the condition of constant amplitude of input signal. Thus, setting P 1=2 0:5 in eq. (315), we have that dB 10 log 0:5 3 decibels; very nearly showing that a halfpower frequency is a frequency at which the power gain of a network is down 3 decibels from its maximum or reference power. Note that, for the PARTICULAR

