| 摘要 |
PROBLEM TO BE SOLVED: To provide an efficient and high-reliable method for calibrating offset error in a differential amplifier. SOLUTION: In the efficient and high-reliable method for calibrating the offset error in a differential amplifier (10), a final calibrated state for the differential amplifier (10) is obtained in accordance with a nonlinear search that requires significantly fewer test stages to complete than linear search methods. As a result, longer test periods can be utilized without adversely affecting the overall length of the calibration process. Because circuit conditions near the calibration point cause internal test signals to switch more slowly from one state to another, lengthening the test period time can allow more time for the internal test signals to reach their final values and, thereby, improve calibration accuracy. COPYRIGHT: (C)2003,JPO
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