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20-9 Connection of a varactor diode in a tuned circuit.
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Under certain conditions, diodes can be made to produce microwave radio signals. There are three types of diodes that do this: Gunn diodes, IMPATT diodes, and tunnel diodes.
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A Gunn diode can produce up to 1 W of RF power output, but more commonly it works at levels of about 0.1 W. Gunn diodes are usually made from gallium arsenide. A Gunn diode oscillates because of the Gunn effect, named after J. Gunn of International Business Machines (IBM) who observed it in the sixties. A Gunn diode doesn t work anything like a rectifier, detector, or mixer; instead, the oscillation takes place as a result of a quirk called negative resistance. Gunn-diode oscillators are often tuned using varactor diodes. A Gunn-diode oscillator, connected directly to a microwave horn antenna, is known as a Gunnplexer. These devices are popular with amateur-radio experimenters at frequencies of 10 GHz and above.
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The acronym IMPATT comes from the words impact avalanche transit time. This, like negative resistance, is a phenomenon the details of which are rather esoteric. An IMPATT diode is a microwave oscillating device like a Gunn diode, except that it uses silicon rather than gallium arsenide. An IMPATT diode can be used as an amplifier for a microwave transmitter that employs a Gunn-diode oscillator. As an oscillator, an IMPATT diode produces about the same amount of output power, at comparable frequencies, as the Gunn diode.
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Another type of diode that will oscillate at microwave frequencies is the tunnel diode, also known as the Esaki diode. It produces only a very small amount of power, but it can be used as a local oscillator in a microwave radio receiver. Tunnel diodes work well as amplifiers in microwave receivers, because they generate very little unwanted noise. This is especially true of gallium arsenide devices. The behavior of Gunn, IMPATT, and tunnel diodes is a sophisticated topic and is beyond the scope of this book. College-level electrical-engineering texts are good sources of information on this subject. You will want to know about how these devices work if you plan to become a microwave engineer.
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Energy emission
Some semiconductor diodes emit radiant energy when a current passes through the P-N junction in a forward direction. This phenomenon occurs as electrons fall from higher to lower energy states within atoms.
378 Some uses of diodes
LEDs and IREDs
Depending on the exact mixture of semiconductors used in manufacture, visible light of almost any color can be produced. Infrared-emitting devices also exist. The most common color for a light-emitting diode (LED) is bright red. An infrared-emitting diode (IRED) produces wavelengths too long to see. The intensity of the light or infrared from an LED or IRED depends to some extent on the forward current. As the current rises, the brightness increases up to a certain point. If the current continues to rise, no further increase in brilliance takes place. The LED or IRED is then said to be in a state of saturation.
Digital displays
Because LEDs can be made in various different shapes and sizes, they are ideal for use in digital displays. You ve probably seen digital clock radios that use them. They are common in car radios. They make good indicators for on/off, a. m. /p. m., battery low, and other conditions. In recent years, LED displays have been largely replaced by liquid-crystal displays (LCDs). This technology has advantages over LEDs, including much lower power consumption and better visibility in direct sunlight.
Communications
Both LEDs and IREDs are useful in communications because their intensity can be modulated to carry information. When the current through the device is sufficient to produce output, but not enough to cause saturation, the LED or IRED output will follow along with rapid current changes. Voices, music, and digital signals can be conveyed over light beams in this way. Some modern telephone systems make use of modulated light, transmitted through clear fibers. This is known as fiberoptic technology. Special LEDs and IREDs produce coherent radiation; these are called laser diodes. The rays from these diodes aren t the intense, parallel beams that you probably imagine when you think about lasers. A laser LED or IRED generates a cone-shaped beam of low intensity. But it can be focused, and the resulting rays have some of the same advantages found in larger lasers.
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