3.2 Pulse Amplitude Modulation( Generation of PAM with natural sampling) Analog bilateral switch Ws(t=W(t*s(t) s(o) clock Figure 3-2 Generation of PAM with natural sampling(gating) 88 3.2 Pulse Amplitude Modulation(Generation of PAM with natural sampling) clock S(f) Analog bilateral switch Ws(t)=w(t)*s(t) Figure 3-2 Generation of PAM with natural sampling (gating)