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lm158做电压跟随器 信号失真

Other Parts Discussed in Thread: LM158, OPA37

大家好,现在问题是这样的,一个幅值为正负12V, 频率为10KHz的双极方波经过电压跟随器后信号波形发生改变,方波信号的前后沿均变缓,在正电压部分幅值下降到非常小。电压跟随器采用LM158芯片构成,接地电阻试过10K以及不接电阻,不接地都试过。但是输出波形还是由方波变成了三角波。请问这是什么原因呢? LM158的带宽足够大:Unity-Gain Bandwidth of 1.2 MHz(运算放大器接的是正负电源) 

谢谢

电压跟随器电路图

电压跟随器输出信号(输入信号为方波)