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运放的对称性问题

运放的对称性在温度低的时候可能不是很明显,影响也不大,但是随着温度的升高(例如从25度~~120度),温度升高输出方波的上述时间跟下降时间偏差也会越大,提高运放的SR能相对的减弱这种不对称的影响,但是导致这种不对称的根本原因是什么?运放的哪些参数可以反映出它的不对称性?