Question

1.) Angle Modulation can be subdivided into phase modulation (PM) and frequency modulation (FM). Highlight the differences between FM and PM. What is meant by the term instantaneous frequency? 2.) Describe what is meant by the term "Zero-Crossings" of a FM or PM wave. 3.) Is PM and/or FM a linear modulation technique? Explain. 4.) Describe one important advantage that angle modulation has over amplitude modulation. Describe one distinct disadvantage that angle modulation has over amplitude modulation. 5.) Describe the steps necessary to determine the bandwidth of a wide-band frequency modulated signal when the modulation waveform m(t) is NOT sinusoidal. 6.) Starting with the standard form for a FM signal show that demodulation can be achieved by a differentiator followed by and envelope detector.

Answer 1

Angl modulatan frquny modulalon In Pm (theu madulateon) tuhrigju, Ha ag Aiu ipnal en u dinidu int au and it modulats uin muag iral (fury modulation) tuhni hil in Fm fuqeny of aviy lvasid y msa Pimd For PM Narris piral nodulats For FM AV 41 1 ) notulet inol

tutontanio furuny apnow Fm war fm Ac co (9ilf) 1natantana ange 8:1) fuquy mtontanuo 2 dt whu ilt) 2Rct +

2 wro 4eum in FM 9 Pm Muans ntamalhimatul tunston hangu (y om peutu fo nyali), utuntl by iatarap (uo velu) in tu aph funutien pomt

rguy heint 3) fm and Fr an Ln mg dulatiin tumisu Bonasly with madualy inatly valiu vaiiu M Fm, phau angd igel, ushil thitfulmodulatrny siral Adurantay oryh modulstion ovru amfhtus Ladulstion nteufunu is ininum to nou hatis irovu futhy y ieluawy duiuon tuy amplitus Dis aduantoy modulatuen ang modulaton us Mqiu linit bandurict itedmodulaton ( Am) ew fqury Am Am lus tly ato fiqny nodulot Lan u nasstn rul to dutue th banduridu widi bond fruny modulats wavr 2 =fuuny diatien Landlurid msay eiaa

6) F dumadulater by dut dffeuntiation is basri to rust Fm into Am ond thm pAm dumo tulator Sclf) dldt Anurlof dutetey /t) -a