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impedances of both of the transistors as a complex R jX value, and we must form a matching network that forces the driver transistor s output impedance to match the load resistance (RL) value as demanded for maximum power output from the driver at its VCC In other words, the PA s input now appears to the driver stage to be the RL that it must be in order to be able to output the required power as needed by the PA stage This must, as well, match the resistive input to the PA and absorb or resonate out any jX part for a conjugate match Matching networks for power amplifiers should normally consist of the T type, rather than the pi type Pi-type matching networks for high-powered amplifiers sometimes result in unrealistic component values at the higher operating frequencies encountered today into a 50-ohm load; T networks are capable of much higher frequency operation before this becomes a major problem Both T and pi networks can be used, however, if the output impedance of the transistor is higher than its load, or the power output of the amplifier is under 15 W To begin the design of a power amplifier, follow these steps for power transistor impedance matching: 1 Look through the transistor s data sheet for the output power versus input power graph (an output power versus frequency graph is similar) to find out how much input power is needed to drive the amplifier for a specific output power, and at the desired frequency of operation As necessary, apply the common formula to see the gain in dB: dB 10 log POUT PIN

Contains machine-readable context information Tags, attributes, and element structure provide the context for interpreting the meaning of content, which opens up possibilities for development Content vs presentation XML tags describe the meaning of the object, not its presentation That is, XML describes the look and feel of a document, and the application presents it as described

Figure 5-3 Drag from one picture to the other to create a photo that s more than the sum of its parts

2 Search the data sheet for the series equivalent impedance on a Smith chart or in a tabular chart to obtain the transistor s series ZIN and ZOUT (ZOL) at the frequency, power, and VCC of interest (Fig 352) 3 Now follow the same matching network design procedures as for small-signal amplifiers to obtain a conjugate match 4 If a wideband power amplifier is required, then frequency-flatten as discussed at the end of this chapter 5 Complete the bias network design for a Class C amplifier as presented in Sec 33, Amplifier Biasing

Web services describe how data is transferred from the cloud to the client We ve mentioned the content of this section in 7, but let s take a look under the hood and see how REST and SOAP work, and which would be best for your cloud needs

any load or VCC, since instability can smoke the transistor because of increased collector currents and high voltages One way to test stability is to decrease VCC to a quarter of its typical value while, with the output placed into its characteristic impedance, varying the input drive level If the amplifier remains stable, then there is a very good likelihood that it will not oscillate

Using the Transform function, Rosch completed the job by tugging at the handles of the moved selection until it fills the bottom of the frame Once saved, the image looks for all the world or all the universe like a single photograph

Representational state transfer (REST) is a way of getting information content from a web site by reading a designated web page that contains an XML file that describes and includes the desired content For instance, REST could be used by your cloud provider to provide updated subscription information Every so often, the provider could prepare a web page that includes content and XML statements that are described in the code Subscribers only need to know the uniform resource locator (URL) for the page where the XML file is located, read it with a web browser, understand the content using XML information, and display it appropriately

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Clients send a request to the web server for information, using the same URL The web site has updated its content, and uses REST to send the information back to the clients