Frequency shift keying modulator having sigma-delta...

Details Frequency shift keying modulator having sigma-delta... Frequency shift keying modulator having sigma-delta...

2008-05-27

2010-02-23

Mis, David (Department: 2817)

Modulators

Frequency shift keying modulator or minimum shift keying...

C375S303000

Reexamination Certificate

active

07667551

ABSTRACT:
A frequency shift keying modulator having sigma-delta modulated phase rotator is disclosed, which includes a phase-locked loop for generating a voltage-controlled signal; a multi-phase generator for receiving the voltage-controlled signal and generating N phase-shift signals having same frequency according to the voltage-controlled signal, the N phase-shift signals having a same phase shift between the phase-shift signals adjacent to each other; a sigma-delta modulator for receiving transmission data and randomly outputting a modulation bit at a modulation clock according to the transmission data; and a phase rotator for receiving the N phase-shift signals and selectively outputting one of the N phase-shift signals and a frequency-divided signal according to the modulation bit, wherein the frequency of the frequency-divided signal is1/(1+nN)of the frequency of any one of the N phase-shift signals.

REFERENCES:
patent: 6420940 (2002-07-01), Minnis et al.

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