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
Ethernet Links Go Green
Everything that uses energy uses too much if it. Energy...
eetimes.com
EEVblog #658 – Mailbag
Mailbag Monday. Dave opens his mail Spoilers: Keithley 177 Multimeter...
eevblog.com
EEVblog #657 – Maker Faire 2014 Interviews
Some interviews from the 2014 Sydney Mini Maker Faire at...
eevblog.com
The Internet of Things Versus Slumlords
Smart thermostats are not only for the well-to-do. One group...
eetimes.com
IBM Watson Speeds Drug Research
IBM Watson moves from supplying known answers to tough questions...
eetimes.com
Samsung Funds III-V FinFETs in US Lab
Samsung is funding Penn State researchers working to fabricate III-V...
eetimes.com
LG, Samsung Debut Smartwatches, Apple Lurks
LG's G Watch R and Samsung's Gear S do little...
eetimes.com
Imagination Takes On Raspberry Pi
Imagination Technologies has developed its own version of Raspberry Pi,...
eetimes.com
California Smartphone Kill-Switch Law: What It Means
Do you understand the consequences of California's new smartphone anti-theft...
eetimes.com
9 Insights From Hot Interconnects
Facebook described its network switch, while experts picked apart flaws...
eetimes.com
Microchip in Pursuit of CSR
Microchip confirmed Thursday that it has had preliminary mutual discussions...
eetimes.com
Are There Marsquakes on Mars?
A 2016 mission will investigate the stuff under the surface...
eetimes.com
Friday Quiz: Forgotten T&M Companies
Remember the names of these test-equipment companies? Most are long...
eetimes.com
Rohm Opens MEMS Foundry Operation
Rohm Co. Ltd. created a foundry business at the six-inch...
eetimes.com
Touch Taiwan: Display Vendors' 10 Bold Forecasts
Display suppliers are in the know. The companies exhibiting at...
eetimes.com
Power Week: RF Charging Startup & Dialog Semi Team Up for Over-the-Air Power
This week, "over-the-air" power got a boost when RF charging...
eetimes.com
9 Notorious Automotive Electronics Recalls
It's been a banner year so far for automotive recalls,...
eetimes.com
Indoor Navigation: The Next Big Thing
Custom system-on-chip from parent company mCube enables Ten Degrees to...
eetimes.com
New UART to WIFI chipset will unleash low cost Internet of Things
WiFi infrastructure is everywhere which makes easier to make network...
wsnblog.com
Data Centers May Ride on ASICs
Firebox, a research prototype in the works at UC Berkeley,...
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 +