Vector FM modulator

Details Vector FM modulator Vector FM modulator

1991-10-17

1993-06-29

Kuntz, Curtis

Pulse or digital communications

Repeaters

Testing

375 67, 332117, 455102, H04L 2720

Patent

active

052241190

ABSTRACT:
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.

REFERENCES:
patent: 4745628 (1988-05-01), McDavid et al.
patent: 4843351 (1989-06-01), Edwards et al.
patent: 5091705 (1992-02-01), Hiramatsu et al.
patent: 5121412 (1992-06-01), Borth

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