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Implementing FSK modulation, demodulation

Posted: 06 Feb 2014  Print Version  Bookmark and Share

Keywords:frequency modulation  FM  Frequency-shift keying  FSK  modulator 

In telecommunications and signal processing, frequency modulation (FM) is encoding of information on a carrier wave by varying the instantaneous frequency of the wave. Digital data can be encoded and transmitted via carrier wave by shifting the carrier's frequency among a predefined set of frequencies—a technique known as frequency-shift keying (FSK). FSK is widely used in modems, radio-teletype and fax modems, and can also be used to send Morse code.

Frequency-shift keying (FSK) is a frequency modulation scheme in which digital information is transmitted through discrete frequency changes of a carrier wave. This application report discusses logic level implementation of binary FSK (BFSK) modulator and demodulator using a phase-locked loop PLL device – CD54HC4046A, CD54HCT4046A, CD74HC4046A, and CD74HCT4046A (hereafter in this document referred to as HC/HCT4046A). BFSK is the simplest FSK, using a pair of discrete frequencies to transmit binary information.

View the PDF document for more information.

Originally published by Texas Instruments at www.ti.com as "Implementation of FSK Modulation and Demodulation using CD74HC4046A".





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