Wide-dynamic-range variable-gain amplifier

H - Electricity – 03 – F

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H03F 3/68 (2006.01) H03G 1/00 (2006.01)

Patent

CA 2324109

A very-wide-dynamic-range amplifier with very low-noise in the high-gain mode and very high-input-overload in the low-gain mode. The amplifier utilizes two parallel signal paths, one a high-gain, low-noise path and the other a low- gain, high-input-overload path. Each path includes a gain-control capability so that the gain of each path, and the contribution of the gain of each path to the overall gain of the amplifier may be smoothly varied from a very low- gain to a very high-gain. Specific embodiments including input impedance matching capabilities are disclosed.

L'invention concerne un amplificateur à très grande dynamique, à très faible bruit en mode à gain élevé et à surcharge d'entrée très élevée en mode à faible gain. Cet amplificateur utilise deux trajets du signal parallèles, un trajet à faible bruit à gain élevé, et un trajet à surcharge d'entrée élevée à faible gain. Chaque trajet comprend une capacité de commande du gain, de sorte que le gain de chaque trajet et la contribution du gain de chaque trajet au gain total de l'amplificateur, peuvent être modifiés en douceur, d'un gain très faible à un gain très élevé. L'invention concerne également des réalisations spécifiques comprenant des capacités correspondant à l'impédance d'entrée.

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