ADI网站上有一个滤波器设计向导,我在里面设计了一个200K的带通滤波电路,参数设置和最后得到的电路图如下,运放没用LT6233,用的是ADA4851-4。
但是在做好板子以后,输入端用信号源输入了一个200K的正弦波(下图蓝色波形),在电路图中阶段D的输出(U2D输出)测到的波形如图中黄色部分,这是电路被输入的波导致振荡的缘故吧?该怎么消除?还是说这是板子的原因,跟电路图没什么关系?
p.baidu.com/itopic/center?uid=4a166162636263636662385cc6
p.baidu.com/itopic/center?uid=46fb6162633863316163635dc6
p.baidu.com/itopic/center?uid=4f316162633337326236665cc6
p.baidu.com/itopic/center?uid=0d5e6162633065383633365cc6
p.baidu.com/itopic/center?uid=dcd36162633061626130615cc6
p.baidu.com/itopic/center?uid=75556162636563623262615cc6
p.baidu.com/itopic/center?uid=9d996162633464363061665cc6
p.baidu.com/itopic/center?uid=a2c36162633834656261375cc6
p.baidu.com/itopic/center?uid=7bd06162633331373865375cc6
p.baidu.com/itopic/center?uid=22076162633735396565615dc6
p.baidu.com/itopic/center?uid=adb86162633938316261665cc6
p.baidu.com/itopic/center?uid=750a6162636363613839385dc6
p.baidu.com/itopic/center?uid=b56e6162633862376238655dc6
p.baidu.com/itopic/center?uid=c3a46162636463343737325dc6
p.baidu.com/itopic/center?uid=ba976162633565376434635dc6
p.baidu.com/itopic/center?uid=e2c46162633031666463345dc6
p.baidu.com/itopic/center?uid=08eb6162636238383231635dc6
p.baidu.com/itopic/center?uid=a8176162636532366366355ec6
p.baidu.com/itopic/center?uid=ba0f6162636437646337315cc6
p.baidu.com/itopic/center?uid=ed256162633135333036655cc6
p.baidu.com/itopic/center?uid=dc1c6162633839396537305cc6
p.baidu.com/itopic/center?uid=ce1f6162633534306465645cc6
p.baidu.com/itopic/center?uid=f1866162636437346436645cc6
p.baidu.com/itopic/center?uid=0aa96162636338376238345cc6
p.baidu.com/itopic/center?uid=40916162636565346262325cc6
p.baidu.com/itopic/center?uid=718c6162633837626435385cc6
p.baidu.com/itopic/center?uid=ab9b6162636138663031655cc6
p.baidu.com/itopic/center?uid=70fe6162633362363361625cc6
p.baidu.com/itopic/center?uid=530b6162633835636233335dc6
p.baidu.com/itopic/center?uid=906c6162633537326138355dc6
p.baidu.com/itopic/center?uid=8b7f6162636630353033325dc6
p.baidu.com/itopic/center?uid=e67f6162633965306232355dc6
p.baidu.com/itopic/center?uid=91a46162633163653030365dc6
p.baidu.com/itopic/center?uid=4b416162636335323835335dc6
p.baidu.com/itopic/center?uid=4f6e6162633133336535315ec6
p.baidu.com/itopic/center?uid=afe06162633439353832315dc6
p.baidu.com/itopic/center?uid=ea626162636133663130355ec6
p.baidu.com/itopic/center?uid=60016162633863356439305ec6
p.baidu.com/itopic/center?uid=08896162633566333635615ec6
p.baidu.com/itopic/center?uid=ae7f6162633335336130335ec6
p.baidu.com/itopic/center?uid=1fbb6162636333323763365ec6
p.baidu.com/itopic/center?uid=c80a6162633030356464315cc6
p.baidu.com/itopic/center?uid=5e8b6162633366373132305ec6
p.baidu.com/itopic/center?uid=a02e6162633031623661325cc6
p.baidu.com/itopic/center?uid=d8d96162633833633432635cc6
p.baidu.com/itopic/center?uid=cb8f6162636162366634655dc6
p.baidu.com/itopic/center?uid=5b4a6162633536653835335dc6
p.baidu.com/itopic/center?uid=f8ac6162633538313261395dc6
p.baidu.com/itopic/center?uid=2d816162636633656339305dc6
p.baidu.com/itopic/center?uid=e5dd6162633139346361375dc6
在整个电路的最后输出地方(U2A)得到的波形如下图,蓝色的波形是输入,黄色的的波形是输出。
下图是我画的电路板,画的是4层板,R31的右侧是输入,OT2是U2D输出,OT3是U2C输出,OT4是U2B输出,JP3左引脚是U2A的输出。