| 摘要 |
An analog offset cancellation technique is based on the observation that the voltage developed across an inductor is proportional to the time derivative of the current passing through the inductor. An input voltage that may contain an undesired DC offset voltage is converted to a current that is representative of the input voltage. The resulting input current is passed through an inductor and the voltage generated across the inductor is used as the new input voltage. Because the voltage developed across the inductor is equal to the time derivative of the current passing through the inductor, the resulting voltage, the new input voltage, is independent of any DC components.
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