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Coupling methods
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In all of the amplifiers you ve seen so far, with the exception of the push-pull circuit (Fig. 24-6), capacitors have been used to allow ac to pass while blocking dc. But there is another way to do this, and in some amplifier systems, it is preferred. This is the use of a transformer to couple signals from one stage to the next. An example of transformer coupling is shown in Fig. 24-11. Capacitors C1 and C2 keep one end of the transformer primary and secondary at signal ground. Resistor R1
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24-9 At A, frequency response for music; at B, for voice signals; at C, for narrowband digital signals.
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limits the current through the first transistor, Q1. (In some cases, R1 might be eliminated.) Resistors R2 and R3 provide the proper base bias for transistor Q2. The main disadvantage of this scheme is that it costs more than capacitive coupling. But transformer coupling can provide an optimum signal transfer between amplifier stages with a minimum of loss. This is because of the impedance-matching ability of transformers. Remember that the turns ratio of a transformer affects not only the input and output voltage, but the ratio of impedances. By selecting the right transformer, the output impedance of Q1 can be perfectly matched to the input impedance of Q2.
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24-10 A simple volume control. Component designators and functions are discussed in the text.
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24-11 Transformer coupling. Component designators and functions are discussed in the text.
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In some amplifier systems, capacitors are added across the primary and/or secondary of the transformer. This results in resonance at a frequency determined by the capacitance and the transformer winding inductance. If the set of amplifiers is intended for just one frequency (and this is often the case in RF systems), this method of coupling, called tuned-circuit coupling, enhances the system efficiency. But care must be taken to be sure that the amplifier chain doesn t get so efficient that it oscillates at the resonant frequency of the tuned circuits! You ll learn about oscillation in the next chapter.
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Radio-frequency amplification
The RF spectrum begins at about 9 kHz and extends upward in frequency to well over 300 GHz, or 300,000,000,000 Hz. A complete discussion of RF amplifier design would occupy a book. Therefore, again, only a sketch of the most important characteristics can be given here.
Weak-signal versus power amplifiers
Some RF amplifiers are designed for weak-signal work. The general circuits, shown earlier in this chapter, are representative of such amplifiers, when the capacitors have values of about 1 F or less. The higher the frequency, the smaller the values of the capacitors. The front end, or first amplifying stage, of a radio receiver requires the most sensitive possible amplifier. Sensitivity is determined by two factors: gain and noise figure. The noise figure of an amplifier is a measure of how well it can amplify the desired signal, without injecting unwanted noise. All bipolar transistors or FETs; create some white noise because of the movement of charge carriers. In general, JFETs produce less noise than bipolar transistors. Gallium arsenide FETs, also called GaAsFETs (pronounced gasfets ), are the least noisy of all. The higher the frequency at which a weak-signal amplifier is designed, the more important the noise figure gets. This is because there is less atmospheric noise at the higher radio frequencies, as compared with the lower frequencies. At 1.8 MHz, for example, the airwaves contain much atmospheric noise, and it doesn t make a significant difference if the receiver introduces a little noise itself. But at 1.8 GHz the atmospheric noise is almost nonexistent, and receiver performance depends much more critically on the amount of internally generated noise. Weak-signal amplifiers almost always use resonant circuits. This optimizes the amplification at the desired frequency, while helping to cut out noise on unwanted frequencies. A typical tuned GaAsFET weak-signal RF amplifier is diagrammed in Fig. 24-12. It is designed for about 10 MHz.
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