Reflecting modulator circuit comprising a negative impedance...

H - Electricity – 04 – L

Patent

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H04L 27/20 (2006.01)

Patent

CA 2377632

A modulator circuit comprises a negative impedance amplifier (6) which is operable such that a signal applied to the amplifier (6) is reflected and amplified. Switching means (14, 16) are provided for switching the impedance of the amplifier (6) between two reflecting states such that the reflected and amplified signal is phase modulated. The impedances of the negative impedance amplifier are selected such that the phase of the reflected and amplified signal switches by substantially 180 degrees. Preferably the impedances of the negative impedance amplifier in the two reflecting states are selected such that the reflection gain of the amplifier in the two reflecting states is substantially the same such that the reflected and amplified signal is a binary phase shift keyed.

La présente invention concerne un circuit modulateur comprenant un amplificateur à impédance négative (6) qui peut fonctionner de sorte qu'un signal appliqué à l'amplificateur (6) est réfléchi et amplifié. Des éléments de commutation (14, 16) servent à la commutation de l'impédance de l'amplificateur (6) entre deux états de réflexion de sorte que le signal réfléchi et amplifié est modulé en phase. Les impédances de l'amplificateur à impédance négative sont sélectionnées de sorte que la phase du signal réfléchi et amplifié est décalée de pratiquement 180 degrés. De préférence, les impédances de l'amplificateur à impédance négative dans les deux états de réflexion sont sélectionnées de sorte que le gain de réflexion de l'amplificateur dans les deux états de réflexion est essentiellement tel que le signal réfléchi et amplifié est modulé par déplacement binaire de phase.

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