MODULATEUR DELTA-SIGMA DOTE D'UN INTEGRATEUR A PARTAGE DE CHARGES

    公开(公告)号:FR2899741A1

    公开(公告)日:2007-10-12

    申请号:FR0651323

    申请日:2006-04-11

    Inventor: ANDRE ERIC

    Abstract: L'invention se rapporte au domaine des dispositifs électroniques susceptibles de réaliser une modulation delta-sigma, tels que les convertisseurs analogique numérique delta-sigma. L'invention met en oeuvre un dispositif modulateur delta-sigma amélioré doté d'une pluralité d'intégrateurs à temps continu dont au moins un intégrateur dit « à partage de charges » en entrée du modulateur, et une pluralité d'intégrateurs purs à la suite de l'intégrateur à partage de charges.

    5.
    发明专利
    未知

    公开(公告)号:DE602005011164D1

    公开(公告)日:2009-01-02

    申请号:DE602005011164

    申请日:2005-03-15

    Abstract: A method for sampling an analog radio frequency signal comprising reception of the analog radio frequency signal, sending of the received signal on two analog channels, each channel performing a first signal sampling operation, including a filtering step eliminating signal frequencies that could fold on the useful signal during sampling such that the sampled signal represents a filtered version of the received signal, wherein the sampling frequency is taken to be equal to the frequency of the signal carrier divided by a factor Ndiv1+½, Ndiv1 being an integer number, to bring the useful signal to half of the sampling frequency after sampling.

    6.
    发明专利
    未知

    公开(公告)号:DE60119015D1

    公开(公告)日:2006-06-01

    申请号:DE60119015

    申请日:2001-02-27

    Abstract: An aberration-correcting optical relay for an optical system. The relay comprises front and rear converging optical units together with a correcting meniscus or two correcting meniscuses placed symmetrically relative to each other, the meniscus(es) having main faces that are substantially concentric, and preferably exactly concentric, the two converging optical units being placed on a common axis and the correcting meniscus(es) being placed on said axis between the two converging optical units. The front converging optical unit situated upstream from the correcting meniscus(es) is placed in such a manner that the distance from an image point of the portion of the optical system upstream from the optical relay to the front converging optical unit is equal to the focal length of the front converging optical unit, said unit thus transforming a beam coming from said image point into a parallel beam.

    7.
    发明专利
    未知

    公开(公告)号:DE60113183D1

    公开(公告)日:2005-10-13

    申请号:DE60113183

    申请日:2001-05-14

    Abstract: The analogue-digital converter comprises a module (100) of pipeline type having a series of dual, that is analogue-digital and digital-analogue, processing stages giving a digital signal SN(nT) representing the input signal e(nT), and an error or noise signal b(nT) obtained by subtracting in each stage the output signal of the preceding stage. The converter also comprises a delta-sigma modulator (210) which digitizes the noise signal b(nT), and the means for subtracting, that is adding with opposite sign, of the digitized noise signal from the digital signal S(nT) after multiplying by a signal transfer function STF(nT). The delta-sigma modulator (210) is placed at the error output of the last stage of the pipeline module (100), and the converter comprises means for deactivation of the delta-sigma modulator. The converter comprises several delta-sigma modulators, each digitizing the output signal of one of the stages, the means for switching in order to activate one of the delta-sigma modulators in the set, and a decimal filter placed downstream to assemble the digitized signals. A communication terminal comprising the means for selecting the frequency band for transmission or reception, includes a converter of proposed type. The method for implementing the analogue-digital conversion of an input signal c(nT) into an output signal yN(nT) includes the digitization of resulting signal bnT) by a delta-sigma modulator, and a subtraction of the digitized signal from the digital signal SN(nT) after multiplying by a signal transfer function STF(nT).

    RECEPTEUR DE SIGNAL RADIO, DU TYPE A FREQUENCE INTERMEDIAIRE

    公开(公告)号:FR2900006A1

    公开(公告)日:2007-10-19

    申请号:FR0603252

    申请日:2006-04-13

    Abstract: L'invention concerne un récepteur de signaux radio comprenant :&circlef; un moyen pour recevoir un signal d'entrée (VAE), modulé par un signal utile (VNU)&circlef; un moyen (41, 50a, 50b) pour changer la fréquence porteuse du signal d'entrée, et produire un signal intermédiaire, de fréquence porteuse égale à une fréquence intermédiaire (fI),&circlef; un moyen (61a, 70a, 81a, 61b, 70b 81b) pour filtrer le signal intermédiaire,&circlef; un moyen de démodulation (91a, 91b, 96) pour supprimer du signal intermédiaire filtré une composante de fréquence égale à la fréquence intermédiaire, et produire le signal utile.Le récepteur selon l'invention est caractérisé en ce qu'il comprend également :&circlef; un circuit de détection (110), pour produire un signal de niveau (VM) représentatif d'un niveau du signal utile,&circlef; un circuit de commande (120), pour appliquer un signal de commande (COM) représentatif du signal de niveau (VM) à une entrée de commande du moyen de changement de fréquence porteuse, du moyen de filtrage et du moyen de démodulation.

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