Chapter 3 Chapter 3 Special Purpose Diodes Special Purpose Diodes Fahmi Samsuri Fahmi Samsuri Analog Electronics Analog Electronics Faculty of Electrical & Faculty of Electrical & Electronic Engineering, Electronic Engineering, KUKTEM KUKTEM
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Chapter 3Chapter 3
Special Purpose DiodesSpecial Purpose Diodes
Fahmi SamsuriFahmi SamsuriAnalog Electronics Analog Electronics Faculty of Electrical & Electronic Faculty of Electrical & Electronic
Engineering, KUKTEMEngineering, KUKTEM
FIGURE 3-1 Zener diode symbol.
FIGURE 3-2 General diode V-I characteristic.
FIGURE 3-3 Reverse characteristic of a zener diode. VZ is usually specified at the zener test current, IZT, and is designated VZT.
FIGURE 3-4 Zener diode equivalent circuit models and the characteristic curve illustrating ZZ.
FIGURE 3-5
FIGURE 3-6
FIGURE 3-7 Partial data sheet for the 1N4728-1N4764 series 1 W zener diodes.
FIGURE 3-8 Zener regulation of a varying input voltage.
FIGURE 3-9
FIGURE 3-10
FIGURE 3-11 Equivalent of circuit in Figure 3-10.
FIGURE 3-12 Zener regulation with a variable load.
FIGURE 3-13
FIGURE 3-14
FIGURE 3-15
FIGURE 3-16 Basic zener limiting action with a sinusoidal input voltage.
FIGURE 3-17
FIGURE 3-18
FIGURE 3-19 The reverse-biased varactor diode acts as a variable capacitor.
FIGURE 3-20 Varactor diode capacitance varies with reverse voltage.
FIGURE 3-21 Varactor diode symbol.
FIGURE 3-22 Partial data sheet for the 1N5139-1N5148 varactor diodes.
FIGURE 3-23 A resonant band-pass filter using a varactor diode for adjusting the resonant frequency over a specified range.
FIGURE 3-24
FIGURE 3-25 Symbol for an LED. When forward-biased, it emits light.
FIGURE 3-26 Electroluminescence in a forward-biased LED.
FIGURE 3-27 Basic operation of an LED.
FIGURE 3-28 Examples of typical spectral output curves for LEDs.
FIGURE 3-29 General radiation pattern of a typical LED.
FIGURE 3-30 Typical LEDs.
FIGURE 3-31 Partial data sheet for an MLED81 1R light-emitting diode.
FIGURE 3-32 The 7-segment LED display.
FIGURE 3-33 Photodiode.
FIGURE 3-34 Typical photodiode characteristics.
FIGURE 3-35 Operation of a photodiode.
FIGURE 3-36 Partial data sheet for the MRD821 photodiode.
FIGURE 3-37 Symbol for a current regulator diode.
FIGURE 3-38 Typical characteristic curve for a current regulator diode.
FIGURE 3-39 Schottky diode symbol.
FIGURE 3-40 Basic internal construction of a Schottky diode.
FIGURE 3-41 PIN diode.
FIGURE 3-42 PIN diode characteristics.
FIGURE 3-43 Tunnel diode symbols.
FIGURE 3-44 Tunnel diode characteristic curve.
FIGURE 3-45 Parallel resonant circuit.
FIGURE 3-46 Basic tunnel diode oscillator.
FIGURE 3-47 Basic laser diode construction and operation.
FIGURE 3-48 Zener-regulated power supply test.
FIGURE 3-49 Indications of an open zener.
FIGURE 3-50 Indication of excessive zener impedance.
FIGURE 3-51 Basic system concept and block diagram of the counting and control system.
FIGURE 3-52 Zener regulated power supply preliminary schematic.
FIGURE 3-53 Basic schematics of the IR emitter and IR detector circuits.
FIGURE 3-54 Power supply and IR emitter/detector printed circuit board. All black resistor bands indicate values to be determined.
FIGURE 3-55 Power supply and IR emitter/detector test bench.
FIGURE 3-56 Test results of three prototype circuit boards.
FIGURE 3-57 Diode symbols.
FIGURE 3-58
FIGURE 3-59
FIGURE 3-60
FIGURE 3-61 File circuits are identified with a CD logo and are in the Problems folder on your CD-ROM. Filenames correspond to figure numbers (e.g., F03-61).
FIGURE 3-62
FIGURE 3-63
FIGURE 3-64
FIGURE 3-66
FIGURE 3-67
FIGURE 3-68
FIGURE 3-69
FIGURE 3-70
FIGURE 3-71
FIGURE 3-72
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