Output stage of operational amplifier suitable for mounting...

H - Electricity – 03 – F

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H03F 3/45 (2006.01) H03F 1/02 (2006.01) H03F 1/30 (2006.01)

Patent

CA 2179465

An output stage (418) for an operational amplifier (403) powered by a first supply voltage rail (102) and a second supply voltage rail (104) includes a buffer (100) and a current booster (500) for amplifying an input voltage (105) into a low impedance output signal (117 and 520). The buffer (100) amplifies the input voltage (105) into the amplified output signal (117 and 520) when the input voltage (105) is within a buffer voltage range (210), the buffer voltage range (210) contained within a maximum voltage range (208) defined by a voltage difference in the first supply voltage rail (102) and the second supply voltage rail (104). The current booster (500) assists the buffer (100) in amplifying the input voltage (105) into the output signal (117 and 520) when the input voltage (105) is outside of the buffer voltage range (210) but within the maximum voltage range (208).

L'étage de sortie (418) d'un amplificateur opérationnel (403) alimenté par un premier conducteur d'alimentation (102) et un second conducteur d'alimentation (104) est doté d'un tampon (100) et d'un amplificateur de courant (500) qui amplifie sa tension d'entrée (105) pour la transformer en un signal de sortie à basse impédance (117 et 520). Le tampon (100) effectue cette amplification quand sa tension d'entrée (105) se trouve dans sa gamme de tensions admissibles (210), cette gamme (210) se trouvant dans une gamme de tensions maximales (208) définie par la différence des tensions du premier conducteur d'alimentation (102) et du second conducteur d'alimentation (104). L'amplificateur de courant (500) aide le tampon (100) en amplifiant la tension d'entrée (105) pour produire le signal de sortie (117 et 520) quand la tension d'entrée (150) se trouve en dehors de la gamme des tensions admissibles du tampon (210), mais dans sa gamme de tensions maximales (208).

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