Offset correction circuit and dc amplification circuit

H - Electricity – 03 – F

Patent

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H03F 3/38 (2006.01) H03F 1/30 (2006.01)

Patent

CA 2248337

An offset correction circuit containing an integrator is provided between output of a first DC amplifier and input of a second DC amplifier, and the integrator corrects not only an offset error caused by an input signal in the first DC amplifier, but also an offset error caused by an input signal in the second DC amplifier. Thus, the effect of the offset error proportional to the integral value of the input signal strength, occurring depending on the temperature stability or power supply voltage variation rate resulting from the input signal in the two DC amplifiers can be canceled.

Circuit de correction de décalage, contenant un intégrateur, monté entre la sortie d'un premier amplificateur c.c. et l'entrée d'un deuxième amplificateur c.c. L'intégrateur corrige non seulement les erreurs de décalage causées par le signal d'entrée du premier amplificateur c.c., mais aussi celles qui sont causées par le signal d'entrée du deuxième amplificateur c.c. Ainsi peut être annulé l'effet de l'erreur de décalage proportionnelle à la valeur entière de l'intensité du signal d'entrée, qui dépend de la stabilité thermique ou du taux de variation de la tension d'alimentation résultant du signal d'entrée des deux amplificateurs c.c.

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