Quadrature modulator and demodulator

Details Quadrature modulator and demodulator Quadrature modulator and demodulator

H - Electricity

03

D

H03D 3/00 (2006.01)

Patent

CA 2435720

Quadrature demodulator (10) and quadrature modulator (30) which comprise a first oscillator (11) and a second oscillator (12), a separate excitation signal being fed to the first osciallator (11) and second oscillator (12) in order to determine the point in time at which switching between two stable states takes place, and the quadrature demodulator (10) and quadrature modulator (30) further comprise excitation means (17, 18). In the quadrature demodulator (10), an input signal Si(t) is fed, by means of which signal a parameter of one of the elements of the first and the second oscillator (11,12) is influenced and a set of quadrature output signals Io, Qo is produced. In the quadrature modulator, a first quadrature signal and a second quadrature signal are fed to the quadrature modulator (30), by means of which signals a parameter of one of the elements of the first and the second oscillator (11, 12) is influenced, and the quadrature modulator (30) further comprises summing means (31) in order to produce a modulated output signal So (t).

L'invention concerne un démodulateur (10) en quadrature et un modulateur (30) en quadrature comprenant un premier oscillateur (11) et un second oscillateur (12), un signal d'excitation séparé étant envoyé au premier oscillateur (11) et au second oscillateur (12) afin de déterminer le moment auquel se produit la commutation entre deux états stables. Le démodulateur (10) en quadrature et le modulateur (30) en quadrature comprennent également des organes (17, 18) d'excitation. Dans le démodulateur (10) en quadrature, un signal d'entrée S¿i?(t) est transmis au moyen duquel un paramètre d'un des éléments du premier et du second oscillateur (11, 12) est influencé et un ensemble de signaux de sortie en quadrature I¿o?, Q¿o? est généré. Dans le modulateur en quadrature, un premier signal en quadrature et un second signal en quadrature sont transmis au modulateur (30) en quadrature, au moyen desquels un paramètre d'un des éléments du premier et du second oscillateur (11, 12) est influencé. Le modulateur (30) en quadrature comprend également des organes (3) de sommation servant à générer un signal de sortie modulé S¿o?(t).

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