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我做了个差分放大电路,结果信号没有放大,反而缩小了,求助

Other Parts Discussed in Thread: TINA-TI

我做了个差分放大电路,芯片型号是LMH6703MF。输入两路正弦波,相位差180.峰峰值300mv。结果输出的时候不仅没有放大,反而缩小到了50多mv。请教一下为什么会出现这种情况?