Three-terminal inverting hysteretic transistor switch

Details Three-terminal inverting hysteretic transistor switch Three-terminal inverting hysteretic transistor switch

H - Electricity

03

K

H03K 3/12 (2006.01) H03K 3/2893 (2006.01) H03K 3/3565 (2006.01) H03K 17/30 (2006.01)

Patent

CA 2417378

An Inverting hysteretic transistor switch having an input terminal (13), an output terminal (17) and a ground terminal (15) includes, in some embodiments (11), a metal- oxide semiconductor field effect transistor (MOSFET) having an on switching state and an off switching state. The MOSFET includes a drain terminal connected to the output terminal, a gate terminal and a source terminal connected to the ground terminal. The switch further includes a hysteresis circuit (12) connected to the input terminal and to the gate terminal of the MOSFET. In use, with an input voltage having low-to-high and high-to-low input voltage transitions applied to the input terminal, the hysteresis circuit switches the MOSFET to its on switching state at a first threshold voltage during low-to- high input voltage transitions. In addition, the hysteresis circuit switches the MOSFET to its off switching state at a second threshold voltage, which is less than the first threshold voltage, during high-to-low input voltage transitions.

L'invention porte sur un commutateur à transistor à inversion d'hystérèse comportant une borne d'entrée (13), une borne de sortie (17), une borne de terre (15), et dans certaines exécutions (11), un transistor MOSFET pouvant commuter de l'état off à l'état on. Le MOSFET comporte une borne de drain reliée à la borne de sortie, et une borne de grille reliée à la borne de terre. Le commutateur comporte en outre un circuit (12) d'hystérèse relié à la borne d'entrée et à la borne de grille du MOSFET. En utilisation, lors des transitions de tension où la tension appliquée à la borne d'entrée passe de faible à forte et de forte à faible, le circuit d'hystérèse fait passer le MOSFET à l'état on et à une première tension seuil lors des transitions où la tension passe de faible à forte, et à l'état off et à une deuxième tension seuil lors des transitions où la tension passe de forte à faible.

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