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OPA2365用作三相下桥臂电流检测,测得的电流波形不对称

采用此电路做电流检测测得的波形如IC所示,与其他两相相比明显不对称(其他两相采用集成电流检测运放测得),这是什么原因导致的?有没有解决方法?推荐的运放类型?