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IN THE PRECEDING TWO CHAPTERS, YOU SAW SCHEMATIC DIAGRAMS WITH BIPOLAR and field-effect transistors. The main intent was to acquaint you with biasing schemes. Some of the diagrams were of basic amplifier circuits. This chapter examines amplifiers more closely, but the subject is vast. For a thorough treatment, you should consult a book devoted to amplifiers and amplification.

Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.

phase-locked loop (PLL).

The extent to which a circuit amplifies is called the amplification factor. This can be given as a simple number, such as 100, meaning that the output signal is 100 times as strong as the input. More often, amplification factor is specified in units called decibels, abbreviated dB. It s important to keep in mind what is being amplified: current, voltage, or power. Circuits are designed to amplify one of these aspects of a signal, but not necessarily the others. In a given circuit, the amplification factor is not the same for all three parameters.

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itive or negative, depending on whether the VCO has drifted higher or lower in frequency. The error voltage is applied to a varactor, causing the VCO frequency to change in a direction opposite to that of the drift. This forms a dc feedback circuit that maintains the VCO frequency at a precise value. It is a loop circuit that locks the VCO onto a particular frequency by means of phase sensing, hence the term phase-locked loop (PLL). The key to the stability of the PLL lies in the fact that the reference oscillator is crystalcontrolled. A block diagram of a PLL circuit is shown in Fig. 24-17. When you hear that a radio receiver, transmitter, or transceiver is synthesized, it usually means that the frequency is determined by a PLL. The stability of a synthesizer can be enhanced by using an amplified signal from the shortwave time-and-frequency broadcast station WWV at 2.5, 5, 10, or 15 MHz, directly as the reference oscillator. These signals are frequency-exact to a minuscule fraction of 1 Hz, because they are controlled by atomic clocks. Most people don t need precision of this caliber, so you won t see consumer devices like ham radios and shortwave receivers with primary-standard PLL frequency synthesis. But it is employed by some corporations and government agencies.

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You don t perceive loudness directly. Instead, you sense it in a nonlinear way. Physicists and engineers have devised the decibel system, in which amplitude changes are expressed according to the logarithm of the actual value (Fig. 24-1), to define relative signal strength. Gain is assigned positive decibel values; loss is assigned negative values. Therefore, if signal A is at 6 dB relative to signal B, then A is stronger than B; if signal A is at 14 dB relative to B, then A is weaker than B. An amplitude change of plus or minus 1 dB is about equal to the smallest change a listener can detect if the change is expected. If the change is not expected, then the smallest difference a listener can notice is about plus or minus 3 dB. 433

In an oscillator, the term stability has two meanings: constancy of frequency (or minimal frequency drift), and reliability of performance.

Suppose there is a circuit with an rms ac input voltage of Ein and an rms ac output voltage of Eout. Then the voltage gain of the circuit, in decibels, is given by the formula: Gain (dB) 20 log10(Eout/Ein)

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The logarithm function is abbreviated log. The subscript 10 means that the base of the logarithm is 10. (Logarithms can have bases other than 10. This gets a little sophisticated, and it won t be discussed here.) You don t have to know the mathematical theory of logarithms to calculate them. All you need, and should buy right this minute if you don t have one, is a calculator that includes logarithm functions. From now on, the base-10 logarithm will be called just the logarithm, and the subscript 10 will be omitted.

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