Vector fm modulator

Details Vector fm modulator Vector fm modulator

H - Electricity

03

C

H03C 3/00 (2006.01) H03C 1/00 (2006.01) H04B 1/04 (2006.01) H03C 1/50 (2006.01) H03C 3/40 (2006.01) H03C 5/00 (2006.01)

Patent

CA 2080786

A cellular-telephone transmitter (10) employs a vector modulator (14). An integrating circuit (52) generates the integral of the message signal and applies it to circuitry (54, 56) for generating in-phase and quadrature modulation signals representing the cosine and sine, respectively, of the integrating-circuit output. The vector modulator (14) produces the desired FM signal by adding together quadrature and in- phase versions of a carrier in proportion to the values that the quadrature and in-phase modulating signals represent.

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