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Figure 2-2C.Frequency response curves
Figure 2-3B.Frequency-response curves for Q3

Neets Module 08-Introduction to Amplifiers
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2-7 Figure 2-2D.—Frequency response curves. Now look at view (C). This frequency-response curve is for an rf amplifier. The frequency limits of this amplifier are 100 kilohertz (f1) and 1 megahertz (f2); therefore, the bandwidth of this amplifier is 900 kilohertz. View (D) shows another audio amplifier. This time the frequency limits are 30 hertz (f1) and 200 hertz (f2). The bandwidth of this amplifier is only 170 hertz. The important thing to notice in view (D) is that the frequency scale is different from those used in other views. Any frequency scale can be used for a frequency-response curve. The scale used would be determined by what frequencies are most useful in presenting the frequency-response curve for a particular amplifier. Q-1. What is the bandwidth of an amplifier? Q-2. What are the upper and lower frequency limits of an amplifier? Q-3. What are the upper and lower frequency limits and the bandwidth for the amplifiers that have frequency-response curves as shown in figure 2-3?






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