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DAC8806的双极性锯齿波失真现象

Other Parts Discussed in Thread: DAC8806, OPA2277

我用DAC8806的双极性应用,按照手册Figure42搭建电路,利用FPGA给数,DAC8806给+5V供电,OPA2277给+/-5V供电。在输出锯齿波时,无论怎么调整输出幅值及输出频率,总会在负半部分出现失真现象。我的程序和示波器观察图像已在附件中。麻烦看看可能是什么问题,谢谢。

Verilog.7z