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高通滤波器接由TLC372构成过零比较器,为何在低频时比较器输入的交流电压被抬升了几百毫伏??望各位大虾指教!

Other Parts Discussed in Thread: TLC372

输入是:峰峰值为0~2V的单极性正弦波,频率为10Hz。单独的高通和TLC比较器都能正常工作,当他们接到一起后,从高通滤波器输出的波形明显被抬升了好几百毫伏(应该是规则的正弦波的)。不知道为什么,跟TLC内部结构有关系吗?望指教!电路图如下:

仿真图如下: