Quantcast
FOSTER-SEELEY DISCRIMINATOR

Share on Google+Share on FacebookShare on LinkedInShare on TwitterShare on DiggShare on Stumble Upon
Custom Search
 
  
 
3-12 Figure 3-9C.—Slope detector. DIODE DETECTOR. Q-21. What is the simplest form of fm detector? Q-22. What is the function of an fm detector? FOSTER-SEELEY DISCRIMINATOR The FOSTER-SEELEY DISCRIMINATOR is also known as the PHASE-SHIFT DISCRIMINATOR. It uses a double-tuned rf transformer to convert frequency variations in the received fm signal to amplitude variations. These amplitude variations are then rectified and filtered to provide a dc output voltage. This voltage varies in both amplitude and polarity as the input signal varies in frequency. A typical discriminator response curve is shown in figure 3-10. The output voltage is 0 when the input frequency is equal to the carrier frequency (fr). When the input frequency rises above the center frequency, the output increases in the positive direction. When the input frequency drops below the center frequency, the output increases in the negative direction. Figure 3-10.—Discriminator response curve. The output of the Foster-Seeley discriminator is affected not only by the input frequency, but also to a certain extent by the input amplitude. Therefore, using limiter stages before the detector is necessary. Circuit Operation of a Foster-Seeley Discriminator View (A) of figure 3-11 shows a typical Foster-Seeley discriminator. The collector circuit of the preceding limiter/amplifier circuit (Q1) is shown. The limiter/amplifier circuit is a special amplifier circuit which limits the amplitude of the signal. This limiting keeps interfering noise low by removing


Electrical News
Hubble Turns 24: 5 Biggest Discoveries
The Hubble Space Telescope has helped solve huge questions about...
eetimes.com
IoT: A Return to Our Favorite EDA Requirements
For the electronic design automation (EDA) industry, the Internet of...
eetimes.com
Life Without DropBox? Unthinkable!
Once you've installed the DropBox app on your computers, anytime...
eetimes.com
New IC for Driverless LEDs
A Eurolighting module produces flicker-free LED light from 230 VAC....
eetimes.com
SanDisk Finds Profit Behind the Tech Curve
Focus and frugality put SanDisk in several sweet spots in...
eetimes.com
Will 'Makers' Help Chip Guys' Bottom Line?
Are you seeing this newborn love among "makers," board vendors,...
eetimes.com
Where Are DRAM Interfaces Headed?
What comes after today's fastest interfaces? Jim Handy talks about...
eetimes.com
IoT Requires Continuous Development
The Internet of Things will add so much programmability to...
eetimes.com
AMD Narrows Its Losses in Q1
As sales of PC continue to decline, AMD is looking...
eetimes.com
Quantum-Dot Windows Harvest Solar Energy
The windows of the future could harvest the sunlight passing...
eetimes.com
Patent Lessons From Apple v. Samsung
The Apple v. Samsung case exposes vast gray areas in...
eetimes.com
Fitness Wearables Lack Accuracy
A new generation of wearable fitness sensors is needed to...
eetimes.com
Bagels: Official Food of Test & Measurement
A bagel is the perfect food to eat at your...
eetimes.com
Max's BADASS Display, Part 3
Now we come to consider the various ways in which...
eetimes.com
Smartphones, 28nm Tech Drive TSMC 1Q Revenue
Thanks to demand for high-end smartphones and investment in technology...
eetimes.com
Quantenna Speeds Up WiFi
As several major companies roll out 802.11ac solutions with multi-user,...
eetimes.com
Samsung Patent Leaks Point to Google Glass Competitor
In a series of leaked patent documents from South Korea,...
eetimes.com
IMEC Adds Image Sensors to Commercial Development Service
The Belgian company has published a brochure that boasts of...
eetimes.com
Why iBeacon Is Important for You
It's true that iBeacon may help you find a restaurant...
eetimes.com
Sensors Combat Corrosion
The energy Piplines Cooperative Research Centre and Deakin University (Australia)...
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 +