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Questions 16 and 17.
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20. The phase of a sine wave signal can be shifted 180 by (a) applying the signal to the input of a timer. (b) applying the signal to the inverting input of an op amp. (c) applying the signal to the input of a flip-flop. (d) applying the signal to the input of an SRAM chip.
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CHAPTER
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ELECTRON TUBES, ALSO CALLED TUBES OR VALVES (IN ENGLAND), ARE USED IN SOME ELECTRONIC
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equipment. In a tube, the charge carriers are free electrons that travel through space between electrodes inside the device. This makes tubes fundamentally different from semiconductor devices, in which charge carriers move among atoms in a solid medium.
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There are two basic types of electron tube: the vacuum tube and the gas-filled tube. As their names imply, vacuum tubes have virtually all the gases removed from their envelopes. Gas-filled tubes contain elemental vapor at low pressure.
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Vacuum Tube Vacuum tubes accelerate electrons to high speeds, resulting in large currents. This current can be focused into a beam and guided in a particular direction. The intensity and/or beam direction can be changed with extreme rapidity, producing effects such as rectification, detection, oscillation, amplification, signal mixing, waveform displays, spectral displays, and video imaging. Gas-Filled Tube Gas-filled tubes have a constant voltage drop, no matter what the current. This makes them useful as voltage regulators for high-voltage, high-current power supplies. Gas-filled tubes can withstand conditions that would destroy semiconductor regulating devices. Gas-filled tubes emit infrared (IR), visible light, and/or ultraviolet (UV). This property can be put to use for decorative lighting. A small neon bulb can be employed to construct an AF relaxation oscillator (Fig. 29-1). Diode Tube Even before the year 1900, scientists knew that electrons could carry electric current through a vacuum. They also knew that hot electrodes emit electrons more easily than cool ones. These phenom504
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Electrodes in a Tube 505
29-1 A neon bulb oscillator,
also known as a relaxation oscillator.
ena were put to use in the first electron tubes, known as diode tubes, for the purpose of rectification. Diode tubes are rarely used nowadays, although they can still be found in some power supplies that are required to deliver several thousand volts for long periods at a 100 percent duty cycle (that is, continuous operation).
Electrodes in a Tube
In a tube, the electron-emitting electrode is the cathode. The cathode is usually heated by means of a wire filament, similar to the glowing element in an incandescent bulb. The heat drives electrons from the cathode. The cathode of a tube is analogous to the source of an FET, or to the emitter of a bipolar transistor. The electron-collecting electrode is the anode, also called the plate. The plate is the tube counterpart of the drain of an FET or the collector of a bipolar transistor. In most tubes, intervening grids control the flow of electrons from the cathode to the plate. The grids are the counterparts of the gate of an FET or the base of a bipolar transistor.
Directly Heated Cathode In some tubes, the filament also serves as the cathode. This type of electrode is called a directly heated cathode. The negative supply voltage is applied directly to the filament. The filament voltage for most tubes is 6 V or 12 V dc. It is important that dc be used to heat the filament in this type of tube, because ac will tend to modulate the output. The schematic symbol for a diode tube with a directly heated cathode is shown in Fig. 29-2A. Indirectly Heated Cathode In many types of tubes, the filament is enclosed within a cylindrical cathode, and the cathode gets hot from the IR radiated by the filament. This is an indirectly heated cathode. The filament normally receives 6 V or 12 V ac or dc. In an indirectly heated cathode arrangement, ac does not cause modulation problems, as it can with a directly heated cathode tube. The schematic symbol for a diode tube with an indirectly heated cathode is shown in Fig. 29-2B. Because the electron emission in a tube depends on the filament or heater, tubes need a certain amount of time to warm up before they can operate properly. This time can vary from a few seconds
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