Differential amplifying apparatus
AssigneeCanon Kabushiki Kaisha
InventorYoshikazu Yamazaki
Life of this patent
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Abstract
A differential amplifier amplifies the difference between a signal input to the non-inverting terminal via a capacitor and a signal input to the inverting terminal. A switch switches whether to input the signal to the non-inverting terminal via the capacitor. A resistance is connected between the non-inverting terminal and the inverting terminal. An offset voltage corrector corrects the offset voltage of the differential amplifier based on the output signal of the differential amplifier during a correction period in which the switch is controlled not to input the signal to the non-inverting terminal via the capacitor.
Claims9
A differential amplifying apparatus comprising:
- a differential amplifier which amplifies a difference between a signal input to a first input terminal via a capacitor and a signal input to a second input terminal;
- a switch which switches whether to input the signal to the first input terminal via the capacitor;
- a resistance which is connected between the first input terminal and the second input terminal;
- a corrector which corrects an offset voltage of the differential amplifier based on an output signal of the differential amplifier during a correction period in which the switch is controlled not to input the signal to the first input terminal via the capacitor.
Dependencies are inferred from the claim text.