FM Demodulator- PowerPoint Presentation, Engineering, Electronics Notes | EduRev

Created by: Himanshu Sahney

: FM Demodulator- PowerPoint Presentation, Engineering, Electronics Notes | EduRev

 Page 1


Punjab EDUSAT Society (PES) 
Contact info: email: kulwinderpannu@gmail.com 
  Phone: 97813-00151 
03 Oct, 2012 1 
Page 2


Punjab EDUSAT Society (PES) 
Contact info: email: kulwinderpannu@gmail.com 
  Phone: 97813-00151 
03 Oct, 2012 1 
What We Shall Cover 
• Review of Modulation (with animations) 
• What is demodulation 
• Frequency Demodulation Definition 
• Types of  FM Demodulators 
• Study of Various FM Demodulators 
(Slope, Balanced, Foster-Seeley, Ratio 
and Phase Locked Loop) 
Punjab EDUSAT Society (PES) 
03 Oct, 2012 2 
Page 3


Punjab EDUSAT Society (PES) 
Contact info: email: kulwinderpannu@gmail.com 
  Phone: 97813-00151 
03 Oct, 2012 1 
What We Shall Cover 
• Review of Modulation (with animations) 
• What is demodulation 
• Frequency Demodulation Definition 
• Types of  FM Demodulators 
• Study of Various FM Demodulators 
(Slope, Balanced, Foster-Seeley, Ratio 
and Phase Locked Loop) 
Punjab EDUSAT Society (PES) 
03 Oct, 2012 2 
What is Modulation 
• Modulation is the addition of 
information (or the signal) to an 
electronic or optical signal carrier. 
Modulator 
Carrier 
Wave 
Information 
Modulated 
Signal 
Punjab EDUSAT Society (PES) 
03 Oct, 2012 3 
Page 4


Punjab EDUSAT Society (PES) 
Contact info: email: kulwinderpannu@gmail.com 
  Phone: 97813-00151 
03 Oct, 2012 1 
What We Shall Cover 
• Review of Modulation (with animations) 
• What is demodulation 
• Frequency Demodulation Definition 
• Types of  FM Demodulators 
• Study of Various FM Demodulators 
(Slope, Balanced, Foster-Seeley, Ratio 
and Phase Locked Loop) 
Punjab EDUSAT Society (PES) 
03 Oct, 2012 2 
What is Modulation 
• Modulation is the addition of 
information (or the signal) to an 
electronic or optical signal carrier. 
Modulator 
Carrier 
Wave 
Information 
Modulated 
Signal 
Punjab EDUSAT Society (PES) 
03 Oct, 2012 3 
Types of Modulation 
Common modulation methods include:  
• Amplitude modulation (AM), in which the 
voltage applied to the carrier is varied over 
time  
• Frequency modulation (FM), in which the 
frequency of the carrier waveform is varied 
in small but meaningful amounts  
• Phase modulation (PM), in which the 
natural flow of the alternating current 
waveform is delayed temporarily  
 
Punjab EDUSAT Society (PES) 
03 Oct, 2012 4 
Page 5


Punjab EDUSAT Society (PES) 
Contact info: email: kulwinderpannu@gmail.com 
  Phone: 97813-00151 
03 Oct, 2012 1 
What We Shall Cover 
• Review of Modulation (with animations) 
• What is demodulation 
• Frequency Demodulation Definition 
• Types of  FM Demodulators 
• Study of Various FM Demodulators 
(Slope, Balanced, Foster-Seeley, Ratio 
and Phase Locked Loop) 
Punjab EDUSAT Society (PES) 
03 Oct, 2012 2 
What is Modulation 
• Modulation is the addition of 
information (or the signal) to an 
electronic or optical signal carrier. 
Modulator 
Carrier 
Wave 
Information 
Modulated 
Signal 
Punjab EDUSAT Society (PES) 
03 Oct, 2012 3 
Types of Modulation 
Common modulation methods include:  
• Amplitude modulation (AM), in which the 
voltage applied to the carrier is varied over 
time  
• Frequency modulation (FM), in which the 
frequency of the carrier waveform is varied 
in small but meaningful amounts  
• Phase modulation (PM), in which the 
natural flow of the alternating current 
waveform is delayed temporarily  
 
Punjab EDUSAT Society (PES) 
03 Oct, 2012 4 
Amplitude Modulation Example 
Modulating 
Signal 
Transmitted 
Signal 
Punjab EDUSAT Society (PES) 
03 Oct, 2012 5 
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