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Hexode and Heptode Tubes In some older radio and TV receivers, tubes with four or five grids were sometimes used These tubes had six and seven elements, respectively, and were called hexode and heptode The usual function of such tubes was signal mixing The schematic symbol for a hexode is shown at D in Fig 29-3; the symbol for a heptode is at E You will not encounter hexodes and heptodes in modern electronics, because solid-state components are used for signal mixing Interelectrode Capacitance In a vacuum tube, the cathode, grid(s), and plate exhibit interelectrode capacitance that is the primary limiting factor on the frequency range in which the device can produce gain The interelectrode capacitance in a typical tube is a few picofarads This is negligible at low frequencies, but at frequencies above approximately 30 MHz, it becomes a significant consideration Vacuum tubes intended for use as RF amplifiers are designed to minimize this capacitance

FIGURE 9-5

The most common application of vacuum tubes is in amplifiers, especially in radio and television transmitters at power levels of more than 1 kW Some high-fidelity audio systems also employ vacuum tubes In recent years, tubes have gained favor with some popular music bands Some musicians insist that tube amps provide richer sound than amplifiers using power transistors There are two basic vacuum-tube amplifier circuit arrangements: the grounded-cathode configuration and the grounded-grid configuration

it s very difficult to get a shooter to behave even as well as an old shooter game for the 8-bit Nintendo Simple arcade games These work well if they don t require great speed A good example is any game where your lead game character doesn t have to move across the screen at lightning speed, yet engages the player with simple challenges or collection goals You will want to design around this consideration Sports instance games These games typically take an instance or action event from a sport and build a game around it Examples include a shot on goal game using hockey or basketball Currently, these games simply have to use sports instances since it would be extremely difficult to put a whole baseball or football game onto a cell phone handset and have the game be visible to the eye and perform well enough to offer satisfying game play Simple sports games These are sports games that can be represented well enough without being graphically intense Shuffleboard and bowling are

Grounded Cathode Figure 29-4 is a simplified schematic diagram of a grounded-cathode circuit using a triode tube This circuit is the basis for many tube-type RF power amplifiers and audio amplifiers The input impedance is moderate, and the output impedance is high Impedance matching between the amplifier and the load can be obtained by tapping a coil in the output circuit, or by using a transformer Grounded Grid Figure 29-5 shows a basic grounded-grid RF amplifier circuit The input impedance is low, and the output impedance is high The output impedance is matched by the same means as with the grounded-cathode arrangement The grounded-grid configuration requires more driving (input) power than the grounded-cathode scheme A grounded-cathode amplifier might produce 1 kW of

good examples Sports that are engaging and graphics-light make a good fit for the handsets Puzzle games or simple matching games These games are a more natural fit for handsets, as long as they don t require intense calculations or blazing speed These restrictions, as always, factor directly into your design of a puzzle game Figure 9-6 shows another example of a puzzle game These games have the advantage of being graphically light and can be configured for simple control using the odd key arrangements available on different cell phone handset models Themed quiz games These trivia games (about sports, movies, pop culture, and so on) work well if questions and answers are kept short and responses can be made easily by pressing a number key These kinds of games can be popular and informative when matched with the right source content to create the questions and answers

Microsoft has been the dominant company in the software industry Despite years in court fighting antitrust charges, the company continues to thrive In recent years Microsoft introduced more new products than ever before in its twenty-five-year history including Office XP, Stinger for cell phones, Xbox for games, and Windows XP with the potential to harness its products and websites4 Both large and small companies in the software industry will vie for the huge software market for years to come Companies such as Sun Microsystems, Lotus Development, and Oracle compete in this profitable market Oracle, the largest provider of software for E-business, established Oracle Product Development Exchange to foster collaborative efforts in product development among industry providers5 Career opportunities exist for those who can get in on the ground floor of a young growing company However, the industry is volatile and companies do fail But software expertise is easily marketable these days

FIGURE 9-6

RF output for 10-W input, but a grounded-grid amplifier needs 50 W to 100 W of drive to produce 1 kW of RF output A grounded-grid amplifier has a significant advantage, however: it is less likely to break into unwanted oscillation than a grounded-cathode circuit