Lecture 3: FM Transmitters & Receivers

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1 Leure 3: FM Transmiers & Reeivers Review of Previous Leures Frequeny Modulaion FM Transmier FM Demodulaion Tehniques FM Reeiver Conlusions & Disussions Leure Noes are available from: hp://homepages.unl.a.uk/~aghizas

2 Review of Previous Leures WHAT is Modulaion and WHY we Modulae? Modulaion is a PROCESS by whih he properies of one signal is made o vary he properies of anoher signal! Signals are variaion of Elerial Curren or Volages over ime. Signals have basially THREE basi properies Ampliude Phase Frequeny

3 A Typial Signal: A Sinusoidal Signal x( Asin( A: Is he Ampliude : Is he Phase in Radians : Is he Frequeny in Radians = 2 f f is he Frequeny in Hz

4 Transmier Why Modulaion? Communiaion Channel Reeiver

5 Cond Speeh => 300Hz Wavelengh C f Km Size of he Transmier Anenna: L Km 10

6 Cond Reduion in he Size of Anenna Muli-Signal Transmission over he same hannel Less effeed by Noise

7 How To Inrease The Frequeny? We Sele a known signal (e.g. Sinusoidal and KAKE i TO CARRY he SPEECH signal! How? This is wha we all Modulaion. We Can Make he Ampliude of he Sinusoid To arry i Ampliude Modulaion We Can Make he Frequeny of he Sinusoid To arry i Frequeny Modulaion We Can Make he Phase of he Sinusoid To arry i > Phase Modulaion

8 Ampliude Modulaion x A.M ( A [ K m(]os A os K A m( os Mixer Sum Message, m( Oupu, x A.M. ( KA A os

9 Frequeny Modulaion x F.M. ( A os( K 0 m ( d ( x F.M Message, m(. ( K 0 A (.d os A sin( Mixer -. K Sum 0 m ( d ( Oupu, x F.M. ( Shif by 90 o A os

10 Graphial Illusraion Message x A.M ( A [ 1 K m(]os AM Signal FM Signal Carrier x F.M. ( A os A sin(. K 0 m ( d (

11 FM Demodulaion Modulaion ours in he TRANSMITTER Saion. We have so far managed o CONVERT our MESSAGE signal, m( ino a suiable form for ransmission. Wha is remaining is o design he Reeiver. This is alled he Demodulaion Proess. Demodulaion is he proess ha happens in our RADIOS i.e. he RECEIVER.

12 FM Demodulaion The Reeiver Anenna dees his: The Demodulaor should generae his: FM Signal, x FM ( FM Demodulaion Tehniques Message Signal, m( FM Disriminaor (Slope Deeor Zero-Crossing FM Deeor Travis Disriminaor Tuorial No.1 Foser-Seeley Disriminaor Tuorial No.1 Phase Loked Loop Deeor Workshop No.1 Raio Deeor Suden Invesigaion

13 FM Disriminaor (Slope Deeor Overall Blok Diagram Differeniaor Envelope Deeor FM Signal AM Signal Message Signal

14 How Does The Disriminaor Works? FM Signal AM Signal Differeniaor C V V ou in R f Unmodulaed Carrier Frequeny

15 FM Disriminaor (Envelope Deeion AM Signal Diode, D 1 Reified AM Signal C1 R Peak Deeor C2 Low Low Pass Pass Filer Filer Message Signal

16 Message Signal The Complee Cirui For: FM Disriminaor (Slope Deeor FM Signal C1 Diode, D 1 C3 Low Low Pass Pass Filer Filer R1 R2 C2 High Pass Filer Reifier Peak Deeor d.. Blok Smoohing

17 FM Demodulaion Zero Crossing Deeor Limier Limier FM Signal Differeniaor Differeniaor Reifier Reifier Pulse Pulse Generaor Generaor Low Low Pass Pass Filer Filer Message Signal

18 FM Demodulaion Complee Zero Crossing Deeor Limier Limier Differeniaor Differeniaor Reifier Reifier Pulse Pulse Generaor Generaor Low Low Pass Pass Filer Filer FM Signal Message Signal

19 Conlusions & Some Observaions The proess of Modulaion hanges he properies of one signal wih respe o anoher signal. Two Examples of Modulaion proess is AM & FM. AM & FM are boh very simple o Realize AM is more SENSITIVE o noise and inerferenes han FM FM uses 88 MHz o 108MHz band, AM uses 300KHz o 3MHz.

20 Nex Leure. All Noes are available from he Web Sie Effes of Noise in: FM & AM Sysems Noe: Please read he noes from he Web sie before he nex leure.

21 Referenes A Deailed lis of referenes whih have been used o prepare hese noes are available from My Web Sie. The Workshop for FM will be arried ou Nex Week.

22 Finally..

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