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The Class B Amplifier When a bipolar transistor is biased exactly at cutoff, or an FET is biased exactly at pinchoff under zero-input-signal conditions, an amplifier is working in class B These operating points are labeled on the curves in Figs 24-3 and 24-4 The class B scheme lends itself well to RF power amplification In class B operation, there is no collector or drain current when there is no signal This saves energy, because the circuit does not consume power unless there is a signal going into it (Class A and class AB amplifiers consume some power even when the input is zero) When there is an input signal, current flows in the device during exactly half of the cycle The output signal waveform is greatly different from the input waveshape in a class B amplifier In fact, it is half-wave rectified You ll sometimes hear of class AB or class B linear amplifiers, especially in ham radio The term linear refers to the fact that the modulation waveform is not distorted by such an amplifier, even though the carrier waveform is distorted because the transistor is not biased in the straight-line part of the operating curve Class AB2 and class B amplifiers draw power from the input signal source Engineers say that such amplifiers require a certain amount of drive or driving power to function Class A and class AB1 amplifiers theoretically need no driving power, although there must be an input voltage The Class B Push-Pull Amplifier Sometimes two bipolar transistors or FETs are used in a class B circuit, one for the positive half of the cycle and the other for the negative half In this way, signal waveform distortion is eliminated This is called a class B push-pull amplifier This type of circuit, using two NPN bipolar transistors, is illustrated in Fig 24-5 Resistor R1 limits the current through the transistors Capacitor C1 keeps the input transformer center tap at signal ground, while allowing for some dc base bias Resistors R2 and R3 bias the transistors precisely at their cutoff points The two transistors must be identical Not only should their part numbers be the same, but ideally they should be chosen by experiment to ensure that their characteristic curves are as closely matched as possible Class B push-pull is a popular arrangement for audio-frequency (AF) power amplification It combines the efficiency of class B with the low distortion of class A Its main disadvantage is that it needs two center-tapped transformers, one at the input and the other at the output This makes push-pull amplifiers rather bulky and expensive compared to other types The Class C Amplifier A bipolar transistor or FET can be biased past cutoff or pinchoff, and it will still work as a power amplifier (PA), provided that the drive is sufficient to overcome the bias during part of the cycle This is known as class C operation Bias points for class C are labeled in Figs 24-3 and 24-4 Class C amplifiers are nonlinear, even for amplitude modulation waveforms Because of this, a class C circuit is useful only for signals that are either full-on or full-off Such signals include oldfashioned Morse code, and digital schemes in which the frequency or phase (but not the amplitude) of the signal is varied A class C amplifier needs a lot of driving power The gain is low For example, it might take 300 W of signal drive to get 1 kW of signal power output However, the efficiency is better than that of class A, AB, or B amplifiers Let s take a closer look, now, at what amplifier efficiency is all about.

to open the Save As dialog box Specify a different name for the new script, and then click the Save button

MPs are powerful tools. They allow you to easily and quickly define various types of maintenance operations for your SQL Server instance without needing any T-SQL

2 Delete the two open commands from the script 3 Add an open command that uses a nested reference to open the /Library/Desktop

programming. As you become more experienced and see a need for more tailored plans, you can refine your existing MPs. You can pick and choose between the options in the predefined tasks, and replace some of those with your own T-SQL or SQL Server Agent job tasks. Some DBAs prefer to skip the MPs altogether, and do everything using some combination of T-SQL code, scripting language, and a job scheduler (like SQL Server Agent). I ve done my share of that. What you should remember if you do this is that although it is extremely powerful and allows for ultimate flexibility (you write your own code, after all), the code you write needs to be written, debugged, tested, and maintained over time. I hesitate to leave home-grown maintenance jobs with customers who do not have the competency to maintain this code over time. In many cases, MPs provide a good middle ground, and with the added flexibility introduced in SQL Server 2005, they become even more powerful and versatile.