The frequency response curve (figure) for the filter circuit used for production of AM wave should be

The frequency response curve (figure) for the filter circuit used for production of AM wave should be(a) (i) followed by (iii)(b) (ii) followed by (i)(c) (iii)(d) (iv)

(a, b, c),Key concept:,(i) Side band frequencies-. The AM wave contains three frequencies f,c, ,(f,c, +f,m,) and (f,c,-f,m,),f,c, is called carrier frequency, (f,c, +f,m,) and (f,c, -f,m,) are called side band frequencies.,(f,c ,+ f,m,)- Upper side band (USB) frequency,(f,c, – f,m,): Lower side band (LSB) frequency,Side band frequencies are generally close to the carrier frequency,,(ii) Bandwidth: The two side bands lie on either side of the carrier frequency at equal frequency interval ωm.,So, bandwidth = {(ω,c, + ω,m,) – (ω,c, – ω,m,)} = 2ω,m,To produce an amplitude modulated wave, bandwidth is given by the difference between upper side band frequency and lower side band frequency. Bandwidth = ω,USB ,– ω,LSB ,= (ω,c, + ω,m,) – (ω,c, – ω,m,)

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