Quantcast Tunnel Diode Devices - Continued - 14183_122

Share on Google+Share on FacebookShare on LinkedInShare on TwitterShare on DiggShare on Stumble Upon
Custom Search
 
  
 
2-42 mechanical action called TUNNELING. Tunneling causes the negative-resistance action and is so fast that no transit-time effects occur even at microwave frequencies. The lack of a transit-time effect permits the use of tunnel diodes in a wide variety of microwave circuits, such as amplifiers, oscillators, and switching devices. The detailed theory of tunnel-diode operation and the negative-resistance property exhibited by the tunnel diode was discussed in NEETS, Module 7, Introduction to Solid-State Devices and Power Supplies, Chapter 3. Figure 2-39.—Tunnel-diode characteristic curve. TUNNEL-DIODE OSCILLATORS.—A tunnel diode, biased at the center point of the negative- resistance range (point B in figure 2-39) and coupled to a tuned circuit or cavity, produces a very stable oscillator. The oscillation frequency is the same as the tuned circuit or cavity frequency. Microwave tunnel-diode oscillators are useful in applications that require microwatts or, at most, a few milliwatts of power, such as local oscillators for microwave superheterodyne receivers. Tunnel-diode oscillators can be mechanically or electronically tuned over frequency ranges of about one octave and have a top-end frequency limit of approximately 10 gigahertz. Tunnel-diode oscillators that are designed to operate at microwave frequencies generally use some form of transmission line as a tuned circuit. Suitable tuned circuits can be built from coaxial lines, transmission lines, and waveguides. An example of a highly stable tunnel-diode oscillator is shown in figure 2-40. A tunnel-diode is loosely coupled to a high-Q tunable cavity. Loose coupling is achieved by using a short, antenna feed probe placed off-center in the cavity. Loose coupling is used to increase the stability of the oscillations and the output power over a wider bandwidth.


Electrical News
Creating an 8x8x8 3D LED Cube: The Base PCB
Creating an 8x8x8 3D tri-color LED cube from the ground...
eetimes.com
Allocating MCU Resources Accurately
When you need a new MCU and new I/O for...
eetimes.com
Experts Call for Secure Sensors
Sensor nodes are the most vulnerable point of attack in...
eetimes.com
AMD Integrates X86, GPU & I/O
Early next year, AMD will ship Carrizo, its most integrated...
eetimes.com
Test Your Way to a Better IoT
Better design and test procedures will lead to much lower...
eetimes.com
12 Startups I Saw at Demo
The consumer Internet of Things sector is getting crowded and...
eetimes.com
Megachips: Japan's Best Kept Secret
In a recent interview with EE Times, Megachips' president and...
eetimes.com
Intel Expects 2015 Mobile Speedup
Intel is back on track with mobile, company officials said...
eetimes.com
Culture Is King in Job Search
Programmers, web developers, and software engineers often assume that technical...
eetimes.com
LEDs Go Color-Temperature & Tunable
The LED manufacturer Everlight introduced what it calls the world's...
eetimes.com
Drag An Oscilloscope Through 6km of Mud?
Sponsor Dave in the 2014 Sydney Mud Run, proceeds go...
eevblog.com
Friday Quiz: More Radar
An EE Times reader submitted our second Friday quiz about...
eetimes.com
Dick Smith – Amateur Radio & Adventure
Dick Smith talks about how he got started, the early...
eevblog.com
Want to Present a Paper at ESC Boston 2015?
If you are interested in presenting a paper on the...
eetimes.com
Transparent Car Shows Automotive's Future
TE Connectivity's clear-plastic, full-size model car shows the latest advances...
eetimes.com
Why No One Leaves Linear Technology
Why culture makes Linear Tech a winner....
eetimes.com
The Messe U-Bahn Crush Business Indicator
Electronica's healthy glow means good things for Europe's electronics sector....
eetimes.com
Automotive Industry Drives Chip Demand
Among all major end use-applications for integrated circuits, the automotive...
eetimes.com
Power Week: Duracell Buyout Tied to Wireless Power, EVs?
The acquisition of the Duracell battery brand by Warren Buffett's...
eetimes.com
What Are You Wearing?
The wearables market is at $6B this year and is...
eetimes.com
 


Privacy Statement - Copyright Information. - Contact Us

comments powered by Disqus

Integrated Publishing, Inc.
9438 US Hwy 19N #311 Port Richey, FL 34668

Phone For Parts Inquiries: (727) 755-3260
Google +