500) {this.resized=true; this.width=500; this.alt='这是一张缩略图，点击可放大。\n按住CTRL，滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/73/2279341230982431.jpg?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" onmousewheel="return imgzoom(this);">请指点集成运放电路-信号衰减后滤波(附图)
如图所示,采集传感器交流正弦信号后将幅值衰减为2V(1V~-1V),然后低通滤波,并将信号调整为(3.25V-1.25V)以便进行AD转换,在调试过程中,每单一运放电路均可实现,但连接为整体图如下时,却会出现经过第一运放OP177后的信号(7处)有负半波顶端截平(截去约200mV)失真,3处输出信号也不为正弦信号.将第二运放MCP601电源移除,7处仍保持截平失真不变,请高手指点如何更正以达到期望效果,万分感激!
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