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OPA657跨阻放大,输出脉冲波形叠加在了一个正弦波上,求问怎么消除这个正弦波的干扰。

Other Parts Discussed in Thread: OPA657, TPS61040

OPA657做激光测距,跨阻放大后的波形叠加在一个正弦波上,如下图1图2所示,频率大概在100HZ左右。下图3是放大后的脉冲波形,因为有一个正弦波干扰,会导致每一个脉冲上升沿到来的时间差别较大,从而导致测距误差较大。特求助TI工程师,这个干扰怎么处理掉,谢谢!

sch如图4所示,偏置电压为TPS61040产生的+83V电压。

图1

图2

图3

图4