最近照着芯片资料分别做了OPA657和VCA821两款放大器,但是都出现频带出现尖峰,当频率100K到15M就出现增益增加的情况,波动大概有1DB,15M后就开始衰减。这是PCB布局的问题吗?
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做好电源滤波和退耦,电源线与地线靠近走线,去耦电容紧靠电源引脚。反馈走线尽量短,反馈电阻尽量靠近引脚,不要害怕靠的太近的报错信息,直接忽略就行。X2Y电容是一种三脚电容,你百度一下就知道。