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Analog Communication - FM Modulators - Tutorialspoint 5/17/2020 Analog Communication - FM Modulators In this chapter, let us discuss about the modulators which generate NBFM and WBFM waves. First, let us discuss about the generation of NBFM. Generation of NBFM We know that the standard equation of FM wave is s(t) = A.cos (2011 + Qk; [m (t) at) => s(t) = A,cos(2rf,t) cos(2rk,z fm (t) dt)— A, sin(2rf,t) sin(2ak¢ fm (t) dt) For NBFM, jerky [mat <<1 We know that cos? 1 and sin@=~1 when @ is very small. By using the above relations, we will get the NBFM equation as s(t) = A, cos(2rf,t) — A, sin(2af,t)2nky [m (t) dt The block diagram of NBFM modulator is shown in the following figure. 1/4 https:/www.tutorialspoint.com/analog_communication/analog_communication_fm_modulators.htm