Switching apparatus with cascaded switch sections

H - Electricity – 03 – K

Patent

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344/24

H03K 17/74 (2006.01) H03K 17/16 (2006.01) H04N 5/268 (2006.01)

Patent

CA 2038222

A diode is connected at a first electrode thereof to a source of input signal to be switched via a capacitor and is connected at a second electrode thereof via an output circuit to an output terminal. A bias control circuit, coupled to the diode, provides a first operating mode in which the diode is forward biased for coupling the input signal to the output terminal via the output circuit and provides a second operating mode in which the first electrode of the diode is DC isolated so that the diode rectifies the AC component of the input signal and in so doing generates a reverse bias for self-biasing the diode to a non-conductive condition.

Une première électrode d'une diode est connectée à une source de signaux à commuter par l'intermédiaire d'un condensateur et une seconde électrode de cette diode est connectée à une borne de sortie via un circuit de sortie. Un circuit de commande de polarisation permet d'établir un premier mode de fonctionnement dans lequel la diode est polarisée en direct pour transmettre le signal d'entrée à la borne de sortie via le circuit de sortie, et permet d'établir un second mode de fonctionnement dans lequel la première électrode de la diode est isolée en continu pour que celle-ci redresse la composante alternative du signal d'entrée et engendre par le fait même une tension d'autopolarisation inverse qui la rend non conductrice.

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