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
SD Cards Now Support Contactless Communication
A new specification allows SD memory cards in PCs, smartphones,...
eetimes.com
Putting the 'Wear' in Wearables
Wellograph wants to create a stylish activity tracker that you...
eetimes.com
Talking to Our Tech
Nuance is a leader in speech and imaging applications and...
eetimes.com
Top 10 Candidates for Next-Gen Storage
What's the next step in the evolution of memory? This...
eetimes.com
A Taste of LabVIEW
I attended an introduction to LabVIEW workshop to get some...
eetimes.com
Designing for Wearables: Tremendous Opportunity but Not Without Challenges
The wearables space is wide open and exploding with opportunity,...
edn.com
Memory Product Round Up: September 2014
Summaries of memory products making news this month, including SD...
eetimes.com
Some Days You're the Pigeon, Others You're the Statue
Are cities still commissioning new statues, or is this practice...
eetimes.com
M2M & IoT Meet Asset Tracking
The advent of highly integrated and low cost Field Programmable...
eetimes.com
Where's the Silicon in Silicon Valley?
An engineer who has experienced firsthand the changes that the...
eetimes.com
Teardown.com Analysis: Apple iPhone 6 Plus
Qualcomm appears but not as RF, and the A8 is...
eetimes.com
Maker Faire Meets the Big Apple
Hundreds of large companies, startups, maker spaces, and scientists converged...
eetimes.com
Why You Can't Judge a Company by Its Version 1.0 Product
You really don't need to spend your valuable time fighting...
eetimes.com
Inside Intel's Gen 8 GPU
Intel recently gave a tour inside the workings of its...
eetimes.com
Australian Crowd Source Equity Funding Report
I have been made aware of this Australian government requested...
eevblog.com
Startup's Piezoelectric MEMS Mics May Take Over
By using piezoelectric diaphragm, Vesper claims its MEMS mics today...
eetimes.com
EEVblog #664 – Peltier TEG Energy Harvesting Experiments
Dave plays around with an energy harvesting kit to see...
eevblog.com
Tesla Model S – Australian Test Drive
Dave test drives one of the first right hand drive...
eevblog.com
What Apple Stuffed Inside iPhone 6 Plus
The iPhone 6 Plus packs a host of new tech...
eetimes.com
Secure WiFi Shield for Arduino Platforms
The Arduino Wi-Fi Shield 101 is designed to enable rapid...
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 +