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AM FL Y Quick Response Code Recognizer In None Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications. Generating QR In None Using Barcode printer for Software Control to generate, create QRCode image in Software applications. TeamFly
QR Code 2d Barcode Recognizer In None Using Barcode reader for Software Control to read, scan read, scan image in Software applications. QR Code JIS X 0510 Printer In Visual C#.NET Using Barcode maker for .NET Control to generate, create QR Code ISO/IEC18004 image in .NET framework applications. Quiz 431 A. It is easily damaged by static electricity. B. It needs a high input voltage. C. It draws a large amount of current. D. It produces a great deal of electrical noise. 13. The input impedance of a MOSFET: A. Is lower than that of a JFET. B. Is lower than that of a bipolar transistor. C. Is between that of a bipolar transistor and a JFET. D. Is extremely high. 14. An advantage of MOSFETs over JFETs is that: A. MOSFETs can handle a wider range of gate voltages. B. MOSFETs deliver greater output power. C. MOSFETs are more rugged. D. MOSFETs last longer. 15. The channel in a zerobiased JFET is normally: A. Pinched off. B. Somewhat open. C. All the way open. D. Of Ptype semiconductor material. 16. When an enhancementmode MOSFET is at zero bias: A. The drain current is high with no signal. B. The drain current fluctuates with no signal. C. The drain current is low with no signal. D. The drain current is zero with no signal. 17. An enhancementmode MOSFET can be recognized in schematic diagrams by: A. An arrow pointing inward. B. A broken vertical line inside the circle. C. An arrow pointing outward. D. A solid vertical line inside the circle. 18. In a source follower, which of the electrodes of the FET receives the input signal A. None of them. B. The source. C. The gate. D. The drain. Quick Response Code Printer In .NET Using Barcode drawer for ASP.NET Control to generate, create QR Code image in ASP.NET applications. QR Code Creator In .NET Using Barcode creation for Visual Studio .NET Control to generate, create QR Code image in .NET framework applications. 432 The fieldeffect transistor 19. Which of the following circuits has its output 180 degrees out of phase with its input A. Common source. B. Common gate. C. Common drain. D. All of them. 20. Which of the following circuits generally has the greatest gain A. Common source. B. Common gate. C. Common drain. D. It depends only on bias, not on which electrode is grounded. Encode Denso QR Bar Code In Visual Basic .NET Using Barcode printer for .NET framework Control to generate, create QR Code 2d barcode image in .NET framework applications. Printing Bar Code In None Using Barcode generation for Software Control to generate, create bar code image in Software applications. CHAPTER
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Code 3/9 Creator In None Using Barcode creator for Software Control to generate, create Code 39 Extended image in Software applications. Creating Barcode In None Using Barcode encoder for Software Control to generate, create bar code image in Software applications. IN THE PRECEDING TWO CHAPTERS, YOU SAW SCHEMATIC DIAGRAMS WITH BIPOLAR and fieldeffect 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. Leitcode Creation In None Using Barcode encoder for Software Control to generate, create Leitcode image in Software applications. EAN13 Supplement 5 Encoder In ObjectiveC Using Barcode generation for iPad Control to generate, create GTIN  13 image in iPad applications. The decibel
Paint Code 39 Extended In None Using Barcode maker for Excel Control to generate, create Code39 image in Microsoft Excel applications. Creating 2D Barcode In Visual C#.NET Using Barcode drawer for .NET Control to generate, create 2D Barcode image in .NET applications. 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. Encoding GS1  12 In Java Using Barcode generation for Java Control to generate, create UPC Symbol image in Java applications. Reading Code 128C In None Using Barcode scanner for Software Control to read, scan read, scan image in Software applications. Perception is logarithmic
Code 39 Generation In Java Using Barcode printer for Android Control to generate, create Code39 image in Android applications. Data Matrix 2d Barcode Creation In Java Using Barcode creation for Android Control to generate, create Data Matrix 2d barcode image in Android applications. 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. 241), 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 Copyright 2002, 1997, 1993 by The McGrawHill Companies. Click here for terms of use.
434 Amplifiers
241 The base10 logarithm function for output/input ratios of 1 to 10.
For voltage
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) 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 base10 logarithm will be called just the logarithm, and the subscript 10 will be omitted. Problem 241 A circuit has an rms ac input of 1.00 V and an rms ac output of 14.0 V. What is the gain in decibels First, find the ratio Eout/Ein. Because Eout 14. 0 V and Ein 1.00 V, this ratio is 14.0/1.00, or 14.0. Then, find the logarithm of 14.0. Your calculator will tell you that log 14.0 1.146128036 (it adds a lot of unnecessary digits). Finally, press the various buttons to multiply this number by 20, getting (with my calculator, anyway) 22.92256071. Round off to three significant figures, because that s all you re entitled to: Gain 22.9 dB. Problem 242 A circuit has an rms ac input voltage of 24.2 V and an rms ac output voltage of 19.9 V. What is the gain in decibels The decibel 435 Find the ratio Eout/Ein 19.9/24.2 0.822.... (The three dots indicate extra digits introduced by the calculator. You can leave them in untill the final roundoff.) Find the logarithm of this: log 0.822... 0.0849.... Then multiply by 20: Gain 1.699... dB, rounded off to 1.70 dB. Negative gain translates into loss. A gain of 1.70 dB is equivalent to a loss of 1.70 dB. The circuit of Problem 242 is not an amplifier or if it is supposed to be, it isn t working! If a circuit has the same output voltage as input voltage, that is, if Eout Ein , then the gain is 0 dB. The ratio Eout/Ein is always equal to 1 in this case, and log 1 0. It s important to remember, when doing gain calculations, always to use the same units for the input and the output signal levels. Don t use millivolts for Eout and microvolts for Ein , for example. This applies to current and power also.

