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
IoT Snags $25M in Europe
EuropeCPS aims to spend $25 million over three years helping...
eetimes.com
Festival Redesigns San Francisco
The Market Street Prototyping Festival will transform downtown San Francisco's...
eetimes.com
Mixed-Signal Oscilloscopes to Invade ESC Boston
Designers of embedded systems need to test and troubleshoot designs...
eetimes.com
Philips Offloads LED Lighting Components Unit for $2.8 Billion
Philips has agreed to sell an 80.1 percent stake in...
eetimes.com
Toshiba Ups Ante in 3D NAND Fray
Toshiba's 48-layer BiCS technology will be a stepping stone for...
eetimes.com
3D Qualcomm SoCs by 2016
Qualcomm is doing extensive research into how to build 3D...
eetimes.com
Juggling Data Connectivity Protocols for Industrial IoT
With much legacy equipment existing with older protocols and requiring...
eetimes.com
IoT Sensor Networks Seek Routes
Sensor networks for the Internet of Things present some unique...
eetimes.com
eevBLAB #8 – New Tektronix AGO3000 Oscilloscope
Dave talks about Tektronix’s new unreleased AGO3000 Gravity Compensated Oscilloscope...
eevblog.com
Graphene's First Commercial Success: Energy-Saving Light Bulbs?
The first commercially viable consumer product to use graphene will...
eetimes.com
Samsung Galaxy S6 Edge: Night At The Museum
We took our review model for a whirl at the...
eetimes.com
Power & Signal Over A Single Wire Do More With Less
If power together with signal is your goal, there are...
eetimes.com
EEVblog #729 – Mailbag
Another lengthy mailbag, with plenty of diverse stuff. RCA Airnergy...
eevblog.com
My Mom the Radio Star
Max's Mom was just interviewed on the radio. He says...
eetimes.com
It's an Analog World
It's an Analog World: A handful of companies have risen...
eetimes.com
Smartwatches, Ultra-Thin Notebooks, Odd IoT: Gadgets For Spring
You've heard all about the Apple Watch and Samsung Galaxy...
eetimes.com
Neural Networks Take on Embedded Vision
Synopsys configurable vision coprocessor architecture uses ARC-based RISC cores in...
eetimes.com
Analysts Cool on Intel/Altera Combo
Analysts gave a chilly reception to the idea of Intel...
eetimes.com
Why MediaTek Pushes Cross-Device Sharing Scheme
MediaTek is creating a technology, called CrossMount, that will link...
eetimes.com
OFC: Facebook Engineer Wants Silicon Photonics Now
At the annual panel session for editors and analysts, an...
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 +