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
Nvidia Raises Android Gaming Ante
The Nvidia Tegra K1 inside the Xaomi MiPad and now...
eetimes.com
Learn Signal Integrity Online
Signal-integrity evangelist Eric Bogatin's classes are now available through an...
eetimes.com
25G Ethernet on Tap at IEEE
In the wake of a June launch for an industry...
eetimes.com
NAND Suit: Toshiba Seeks $1.1B From SK Hynix
South Korea's SK Hynix Inc. disclosed in a regulatory filing...
eetimes.com
Cloud-Based Chip Design Research & Education
Semiconductor Research and Silicon Cloud give chip designers global reach....
eetimes.com
Is Your Processor IP ISO 26262-Compliant?
With the growth in ADAS and the growing demand for...
eetimes.com
NI's System-on-Module Technology Aims to Reshape Embedded Market
National Instruments has just released a complete middleware solution for...
eetimes.com
XMOS Sees Key $26M Investment
UK chip designer XMOS has raised $26.2m from three global...
eetimes.com
VC Investments Spike in Q2
US companies posted double-digit increases in second-quarter investments from a...
eetimes.com
5G Calling: US Answers, Sorta
In the third and final part of our series on...
eetimes.com
Engineers Should Study Finance: 5 Reasons Why
Engineers make design decisions that affect the company bottom line,...
eetimes.com
EEVblog #642 – TI Connected Launchpad
Dave checks out the $20 TI EK-TM4C1294XL Tiva C Series...
eevblog.com
MIT Wrist-Robot Adds Extra Fingers
The Massachusetts Institute of Technology (MIT) has created a wrist-worn...
eetimes.com
OCZ Updates SQL Flash Accelerator
Toshiba-owned company makes flash acceleration simple for SQ L DBAs...
eetimes.com
Micro Python Preps for Mass Production
Micro Python is priming the presses. After smashing its Kickstarter...
eetimes.com
Do You Really Need 4 GB of RAM to Type a Letter?
The recent decision by the German parliament to consider a...
eetimes.com
Smart Grid Lessons From a Utility
A smart grid project in Sacramento provided many lessons, especially...
eetimes.com
Friday Quiz: Temperature Measurement
Try your hand at these questions about using temperature sensors...
eetimes.com
MSGEQ7-Based DIY Audio Spectrum Analyzer: Testing
Here's a step-by-step guide for testing a simple 14-band (2...
eetimes.com
17 More NASA Images of Beautiful Engineering
NASA is all about engineering. Here are 17 photos that...
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 +