Direct frequency modulation system having an IQ mixer in the...

Modulators – Frequency modulator – Including stabilization or alternatively distortion – noise...

Reexamination Certificate

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C331S023000

Reexamination Certificate

active

10939587

ABSTRACT:
A transmission arrangement includes a step-up frequency mixer that converts a modulation signal to a transmission frequency. The step-up frequency mixer is arranged within a phase locked loop that further comprises a frequency divider that is likewise supplied with the modulation data, combined with channel pre-selection data, for the purposes of compensation. This arrangement prevents low-frequency components of the modulation signal from being eliminated by the phase locked loop. In addition, noise components and undesirable interference frequency components that are produced in the mixer are suppressed by the phase locked loop.

REFERENCES:
patent: 4449250 (1984-05-01), Kurby
patent: 4481489 (1984-11-01), Kurby
patent: 4994768 (1991-02-01), Shepherd et al.
patent: 6356597 (2002-03-01), Jackson et al.
patent: 6774740 (2004-08-01), Groe
patent: 199 29 167 (2000-12-01), None
patent: 1 063 766 (2000-12-01), None
patent: WO 95/16304 (1995-06-01), None
Chapter 7 “More Complex Configurations”,Frequency Synthesis by Phase Lock, W. F. Egan, John Wiley & Sons, 1981, ISBN 0-471-08202-3, pp. 168-204.

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