By Nagnibida N. I.
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The symbol shown in Figure 3-ISd is often encountered. Unfortunately, it may lead to confusion because it is not evident whether the input is to the inverting or the noninverting terminal; thus, we shall avoid its use. Inverting and Noninverting Terminals. It is important to realize that the positive and neg- ative signs show the inverting aniJ noninverting terminals of the amplifier and do not imply that they are necessarily to be :connected to inputs of the corresponding signs. Thus, if the negative terminal of a battery is connected to the minus or inverting terminaI,: the output of the amplifier is positive with respect to it; i( on the other hand, the positive terminal of the battery is connected to the minus input of the amplifier, a negative output results.
With forward bias, the current increases nearly exponentially with voltage; often currents of several amperes are we shall see, this phenomenon has practical application in electronics. Transistors -I FIGURE 3-2 Current voltage characteristics of a silicon semiconductor diode. Note that, fo~ the sake of clarity, the small current under reverse bias has been exaggerated. observed. Under reverse bias, a current on the order of microamperes flows over a considerable voltage range; in this region, conduction is by the minority carriers.
In Figure 3-68, the signal is assumed to be ac. It is important to note that a dry cell (or other dc source generally) has, for all practical purposes, negligible resistance toward an ac signal; similarly, most ac sources can be assumed to olTer virtually no resistance toward a dc current. Thus, the series arrangement shown will produce an ac signal that is superimposed upon the dc current. That is, the base current is given by (/B + iB) where is is due to the ac signal. Typically, an amplifier such as that shown in Figure 3068 employs a power supply that has an output potential of IS to 30 V dc' normally, the current is produced b;: rectification of 1l0-Vac line output.