Complex valued delta sigma phase locked loop demodulator

H - Electricity – 03 – D

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H03D 3/00 (2006.01) H03D 7/16 (2006.01) H04L 27/233 (2006.01)

Patent

CA 2422794

The demodulator is a multiple stage demodulator. The first stage is a conversion stage which converts an incoming signal into a first complex representation. The second stage is a direct digital synthesizer (DDS)/mixer which synthesizes a signal to be mixed with the first complex signal and performs the mixing operation to produce a second complex output. This second complex signal is controlled by a bitstream fed back from the third stage - a phase quantizer stage. The bitstream represents the quantized phase difference between the synthesized signal and the first complex signal. The DDS/mixer stage then measures the synthesized signal for any phase difference from the incoming signal through the feedback inherent to a PLL, the bitstream thus provides an output that gives the frequency of the desired signal. As a side benefit, the real component of the second complex signal, provides an amplitude estimate of the desired signal.

L'invention concerne un démodulateur à étages multiples. Le premier étage est un étage de conversion consistant à convertir un signal entrant en une première représentation complexe. Le deuxième étage est constitué d'un synthétiseur numérique direct (DDS)/mélangeur synthétisant un signal à mélanger avec le premier signal complexe et effectuant l'opération de mélange en vue de produire une deuxième sortie complexe. Le deuxième signal complexe est commandé par un train binaire retourné via le troisième étage- un étage de quantification de phase. Le train binaire représente la différence de phase quantifiée entre le signal synthétisé et le premier signal complexe. L'étage du DDS/mélangeur mesure ensuite le signal synthétisé pour une différence de phase quelconque provenant du signal entrant via le retour inhérent d'une boucle à verrouillage de phase, le train binaire fournissant ainsi une sortie donnant la fréquence du signal recherché. Il en découle que, grâce à ce démodulateur, le composant réel du deuxième signal complexe fournit une estimation de l'amplitude du signal recherché.

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