Electronics World articles Popular Electronics articles QST articles Radio & TV News articles Radio-Craft articles Radio-Electronics articles Short Wave Craft articles Wireless World articles Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs LinkedIn Crosswords Engineering Humor Kirt's Cogitations RF Engineering Quizzes Notable Quotes Calculators Education Engineering Magazine Articles Engineering software RF Cafe Archives RF Cascade Workbook 2018 RF Symbols for Visio - Word Advertising Magazine Sponsor RF Cafe RF Electronics Symbols for Visio RF Electronics Symbols for Office Word RF Electronics Stencils for Visio Sponsor Links Saturday Evening Post NEETS EW Radar Handbook Microwave Museum About RF Cafe Aegis Power Systems Anritsu Alliance Test Equipment Amplifier Solutions Anatech Electronics Axiom Test Equipment Berkeley Nucleonics Bittele Centric RF Conduct RF Copper Mountain Technologies Empower RF everything RF Exodus Advanced Communications Innovative Power Products ISOTEC KR Filters Lotus Systems PCB Directory Rigol San Francisco Circuits Reactel RFCT TotalTemp Technologies Triad RF Systems Windfreak Technologies Withwave LadyBug Technologies Wireless Telecom Group Sponsorship Rates RF Cafe Software Resources Vintage Magazines Thank you for visiting RF Cafe!
Windfreak Technologies SynthHD PRO - RF Cafe

"Tunnel Diodes" - Experimental Semiconductors
October 1959 Electronics World

October 1959 Electronics World

October 1959 Electronics World Cover - RF Cafe Table of Contents 

Wax nostalgic about and learn from the history of early electronics. See articles from Electronics World, published May 1959 - December 1971. All copyrights hereby acknowledged.

Tunnel diodes came onto the commercial, military, and aerospace scene in the late 1950s. Exploiting the phenomenon of quantum-mechanical tunneling, the device exhibits a negative resistance region which makes it suitable for amplifier and oscillator applications. It also permits operation into the tens of gigahertz realm, which was new ground at the time. X-band and above was the exclusive realm of laboratory-based experiments using klystrons and exotic chemical oscillators (pseudo-maser - microwave amplification by stimulated emission of radiation). Tunnel diodes quickly became a part of miniaturized radar units, battery-powered communications systems, undercover (spy) operations, and many other applications.

"Tunnel Diodes" - Experimental Semiconductors

"Tunnel Diodes" - Experimental Semiconductors, October 1959 Electronics World - RF CafeInsensitive to temperature changes and 100 times faster than today's transistors, these devices bear watching.

Dr. Guy Suits, G-E vice-president and director of research - RF Cafe

Dr. Guy Suits, G-E vice-president and director of research, speaks into microphone, while Dr. Jerome Tiemann holds the transmitter. In foreground, ordinary FM receiver picks up signal.

Tunnel diode is shown in close-up view - RF Cafe

Nestled inside a paper clip, a tunnel diode is shown in close-up view. Connecting wire leads to alloy soldered to germanium crystal which is soldered to metal plate.

Vest-pocket transmitter, making use of a tunnel diode - RF Cafe

Vest-pocket transmitter, making use of a tunnel diode, and with a range of about one-half mile, is demonstrated by G-E scientists.

The newest "baby" in the fast-growing family of semiconductor devices - the "tunnel diode" - is coming of age. The new device, first reported in 1958 by Japanese scientist Leo Esaki, is closer to commercial application as a result of intensive research programs at G-E and other companies. The special diode is a heavily doped junction semiconductor that has a negative-resistance characteristic over part of its operating range (see the graph above).

The tunnel diode takes its name from the physical phenomenon that makes it possible: "quantum-mechanical tunneling." The term is used to describe the manner in which the electrical charges move through the device. Such motion takes place with the speed of light, in contrast to the relatively slow motion of electrical charge carriers in transistors. These high speeds make it possible for the device to operate at extremely high frequencies. Oscillation higher than 2000 mc. has already been obtained and frequencies of more than 10,000 mc. are expected in the near future.

This high-speed response also- suggests applications in computers. When used as switches, tunnel diodes have functioned in a fraction of a millimicrosecond - from 10 to 100 times faster than the fastest transistor now available.

A complete tunnel diode transmitter is compared in size with a 50-cent piece. The transmitter consists of one variable and two fixed ceramic capacitors, a coil that tunes to the operating frequency - which may be higher than 2000 mc. - and the diode itself, located inside the "can" in the center of the device. Battery is not shown.

The device also resists the damaging effects of nuclear radiation. Because it is less dependent on the structural perfection of its crystal than is the transistor, it is much less affected by the damage that radiation can do to such crystal structures. In this respect it outranks transistors by more than 1000 to 1. Materials used for tunnel diodes include silicon, germanium, gallium arsenide, gallium antimonide, and indium antimonide. Silicon tunnel diodes work at temperatures 250°F higher than temperatures at which conventional silicon diodes and transistors operate.

The negative-resistance characteristic allows the unit to be used as an amplifier, a generator of r.f. power, and a switching device. Its simplicity makes possible the development of integrated circuits. It is superior to vacuum tubes and transistors for applications in low-noise amplifiers and mixers for high frequencies. Many parametric amplifier jobs, for example, could be performed more easily with tunnel diodes.

G-E now has plans to offer limited quantities of experimental samples in the next few months. 



Posted August 8, 2018

Rigol DSG5000 Microwave Generator - RF Cafe
Anatech Electronics RF Microwave Filters - RF Cafe
Innovative Power Products Passive RF Products - RF Cafe
RF Electronics Shapes, Stencils for Office, Visio by RF Cafe
Berkeley Nucleonics Corporation - RF Cafe

Please Support RF Cafe by purchasing my  ridiculously low−priced products, all of which I created.

These Are Available for Free


About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024


    Kirt Blattenberger,


RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website: