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- 32. Costas Loop (DSB-SC) Product Modulator Product Modulator A c cos(2 f c t+ ) m(t) LPF LPF Phase Discriminator VCO -90 o cos(2 f c t+ ´(V)) sin(2 f c t+ ´(V)) V=sin2 ´) Objetivo: mantener 0 .5A c cos( ´) m(t) .5A c sin( ´) m(t) ´(V) V 0 DSBSC Demodulator Ref.: Prof. A.Goldsmith, Stanford Univ. EE179