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Extensible Markup Language (XML) is a standard, self-describing way of encoding text and data so that content can be accessed with very little human interaction and exchanged across a wide variety of hardware, operating systems, and applications XML provides a standardized way to represent text and data in a format that can be used across platforms It can also be used with a wide range of development tools and utilities

LNA low-noise design Designing for the lowest noise figure for a small-signal amplifier is required when planning a receiver system for VHF and above And since an exact 50-ohm match will rarely be used in a low-noise amplifier (LNA), only transistors with a K of 1 or more should be adopted in this application A minimum noise figure can be obtained from any transistor by carefully choosing its source load RS and its bias point This optimum source load and bias point can be found either by source resistance (RS) versus collector current (IC) charts or by IC versus NF charts, both available at only a limited number of frequencies on the active device s data sheet The optimal combination of RS versus IC for certain frequencies may also be available on a small Smith chart printed on the data sheet S(opt), which is the optimum source reflection coefficient for the lowest NF, can also be found on many low-noise transistor data sheets To design an LNA, first locate a transistor with a low NF at the desired frequency, then find in the data sheets the IC and RS (or S(opt)) that will give

In the last chapter, we saw how using a flash outdoors can take care of the shadows from hats, hair, and brows that hide faces If you forget to use the flash on location, you can use the Fill Flash feature in Elements Choose Enhance | Adjust Lighting | Fill Flash The dialog box that appears, as in Figure 4-19, has only two controls, both sliders: Lighter and Saturation Moving the Lighter slider to the right manages to lighten mainly those parts of a photo that a real fill flash would affect In Figure 4-19, with the original photo on the left and the flash-filled retouch on the right, the trees and the sky are barely affected

XML Basics XML is very similar to HTML (both are based on the SGML language, which has been a standard since 1986), so those who already know HTML will find it easy to pick up XML That said, there are two major differences between the two:

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Separation of form and content HTML uses tags to define the appearance of text, while XML tags define the structure and the content of the data Individual applications will be specified by the application or associated style sheet XML is extensible Tags can be defined by the developer for specific application, while HTML s tags are defined by W3C

the best NF Now design the bias network to supply the chosen IC, while the optimal source impedance of RS is matched at the transistor s input instead of the true impedance of the source In other words, if we match the low-noise active device to S(opt) by making the LNA see, for instance, the antenna s 50ohm output impedance as this S(opt) value, we can make the LNA transistor supply a low NF (but at an increased VSWR over a perfect power match) We then terminate the transistor s output by: S22

Backlighting is a great effect when you can find it There are only so many sunsets and sunrises every day Elements doesn t let you put backlighting into all photos But for a subject in which it works, the effect is as amazing as the program s Fill Flash effect And simpler Select Enhance | Adjust Lighting | Adjust Backlighting As you see in Figure 4-20, there is only one slider Moving it right darkens the sides of the pears facing the camera But notice that the highlights along the top rims of the pears don t go dark They mimic the way the pears would pick up real backlighting

S12 S21 S(opt) (S11 S(opt))