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
Robots Confront Safety Standards
An emerging crop of industrial robots will be more user-friendly...
eetimes.com
Electronic Brain by 2023
Progress continues on fake brain to be used as test...
eetimes.com
Google, Silicon Labs Mesh for ZigBee-Like Protocol
Google's Nest-led Thread Group is meeting at its campus in...
eetimes.com
Bionic Ear Due Soon
STMicroelectronics collaborates with two companies on a bionic ear that...
eetimes.com
Peek Into BMW's Ultimate Driving Museum
BMW Welt and BMW Museum, located next to BMW headquarters...
eetimes.com
New Common Parts Library Supports Connected Device Design
Online sourcing site Octopart inaugurates a Common Parts Library (CPL)...
eetimes.com
Altera Announces Non-Volatile MAX 10 FPGAs & Eval Kits
MAX 10 FPGAs are of interest for a broad range...
eetimes.com
LPDDR3 Is A Half-Step
The rapid evolution of smartphones drove the quick adoption of...
eetimes.com
IBM Conquers Wafer-Scale Graphene
IBM has found a way to vastly reduce the costs...
eetimes.com
Telecom Capex to Fall 2% in 2015
Telecom carriers are expected to shave their capital spending on...
eetimes.com
EEVblog #668 – Mailbag + FLIR TG165
Help beat Congenital Muscular Dystrophy (Pozible campaign live tomorrow) A...
eevblog.com
Sensors Build Case Against Cold
Heat Seek, grand prize winner of this year's NYC BigApps...
eetimes.com
Let's Talk About Open-Source Hardware
Although the meaning of open source in software is quite...
eetimes.com
DDR Memory Testing: Best-Practices
The strict control of clock and data timing leaves little...
eetimes.com
The Other Tesla
This Indiegogo fundraiser is for a Tesla museum in his...
eetimes.com
The Zen of Spin
The concept of spin is ground-zero in relativistic quantum mechanics...
eetimes.com
Do Results Matter?
Sometimes you have to look past your enthusiasm for developing...
eetimes.com
IoT Calls for Simpler Protocol
Chirp is a simplified messaging scheme geared for the Internet...
eetimes.com
HP Ships First ARM Servers
Hewlett-Packard is shipping its first mainstream commercial servers using the...
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 +