barcode in vb.net 2005 The class-C amplifier in Software

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The class-C amplifier
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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. You might think, at first, that this bias scheme couldn t possibly result in amplification. Intuitively, it seems as if this could produce a marginal signal loss, at best. But in fact, if there is significant driving power, class-C operation can work very well. And, it is more efficient than any of the aforementioned methods. The operating points for class C are labeled in Figs. 24-4 and 24-5. Class-C PAs are never linear, even for amplitude modulation on a signal. Because of this, a class-C circuit is useful only for signals that are either full-on or full-off. Continuous-wave (CW), also known as Morse code, and radioteletype (RYTY) are examples of such signals. Class-C PAs also work well with frequency modulation (FM) because the amplitude never changes. A class-C PA needs a lot of drive. The gain is fairly low. It might take 300 W of radio-frequency (RF) drive to get 1 kW of RF power output. That s a gain of only a little
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PA efficiency 443 over 5 dB. Nonetheless, the efficiency is excellent, and class-C operation is common in CW, RTTY, or FM radio transmitters.
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PA efficiency
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Saving energy is a noble thing. But in electronic power amplifiers, as with many other kinds of hardware, energy conservation also translates into lower cost, smaller size and weight, and longer equipment life.
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Power input
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Suppose you connect an ammeter or milliammeter in series with the collector or drain of an amplifier and the power supply, as shown in Fig. 24-7. While the amplifier is in operation, this meter will have a certain reading. The reading might appear constant, or it might fluctuate with changes in the input signal level.
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24-7 Connection of a current meter for dc power input measurement.
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The dc collector power input to a bipolar-transistor amplifier circuit is the product of the collector current in amperes, and the collector voltage in volts. Similarly, for an FET, the dc drain power input is the product of the drain current and the drain voltage. These power figures can be further categorized as average or peak values. (This discussion involves only average power.) The dc collector or drain power input can be high even when there is no signal applied to an amplifier. A class-A circuit operates this way. In fact, when a signal is applied to a class-A amplifier, the meter reading, and therefore the dc collector or drain power input, will not change compared to the value under no-signal conditions!
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444 Amplifiers In class-AB1 or class-AB2, there is low current (and therefore low dc collector or drain power input) with zero signal, and a higher current (and therefore a higher dc power input) with signal. In class-B and class-C, there is no current (and therefore zero dc collector or drain power input) when there is no input signal. The current, and therefore the dc power input, increases with increasing signal. The dc collector or drain power input is usually measured in watts, the product of amperes and volts. It might be indicated in milliwatts for low-power amplifiers, or kilowatts for high-power amplifiers.
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Power output
The power output of an amplifier must be measured by means of a specialized ac wattmeter. A dc ammeter/voltmeter combination won t work. The design of audio frequency and radio-frequency wattmeters is a sophisticated specialty in engineering. When there is no signal input to an amplifier, there is no signal output, and therefore the power output is zero. This is true no matter what the class of amplification. The greater the signal input, in general, the greater the power output of a power amplifier, up to a certain point. Power output, like dc collector or drain input, is measured in watts. For very low-power circuits, it might be in milliwatts; for high-power circuits it is often given in kilowatts.
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