US Patent 7528659 Fully differential amplification device
Patent 7528659 was granted and assigned to Panasonic on May, 2009 by the United States Patent and Trademark Office.
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An auxiliary current source is provided that includes MOS transistors feeding startup auxiliary current to the input portion of an output common mode voltage generation circuit amplifying the output of a differential amplifier and generating an output common voltage, and a correction current source is provided that includes MOS transistors feeding correction current corresponding to the auxiliary current to a common mode feedback comparator. Thereby, a control loop that controls the output common voltage to a predetermined voltage even when the input of the differential amplifier is outside the dynamic range at the beginning is correctly started up, thereby stabilizing the output common voltage at a desired voltage.
US Patent 07528659 Fully differential amplification device US Patent 7528659 Fully differential amplification device
US Patent 07528659 Fully differential amplification device
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