| 摘要 |
A method for removing the offset from an analog buffer is provided to prevent the excessive charge of an offset voltage by controlling switches for removing the offset from the analog buffer. A non-inverting terminal of an analog buffer as an operational amplifier receives input signals. An inverting terminal of the analog buffer is connected to an input stage via a capacitor(Coffset) for storing offset and a first switch(S1). The inverting terminal of the analog buffer is connected to an output stage thereof through a second switch(S2). The first switch is connected to the output stage through a third switch(S3). The analog buffer is controlled by a first interval, which is used for opening the first switch and closing the second and third switches, a second interval, which is used for closing the first and second switches and opening the third switch, and a third interval, which is used for opening the first and second switches and closing the third switch.
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