Zero if frequency-modulator

Details Zero if frequency-modulator Zero if frequency-modulator

1983-09-30

1985-09-10

LaRoche, Eugene R.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

455 42, 455102, 332 22, H03C 300

Patent

active

045409587

ABSTRACT:
An apparatus for frequency-modulating telecommunication carriers with baseband signals includes an arrangement for generating two quadrature-related baseband signals in two separate channels, wherein each of the quadrature-related baseband signals is a sinusoidal function of the instantaneous angle of the message signal to be transmitted. The apparatus further includes an arrangement for producing a frequency-modulated carrier from the quadrature-related baseband signals, this arrangement including a device that provides two quadrature-related carrier-frequency waveforms, two mixing devices each for individually mixing one of the quadrature-related carrier-frequency waveforms with one of the quadrature-related baseband signals in one of the channels, and a combining device which combines the output signals from the two channels into a single frequency-modulated carrier-frequency output signal.

REFERENCES:
patent: 4438413 (1984-03-01), Ryan

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