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放大器专区
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考考你——是先滤波再放大,还是先放大再滤波?
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考考你——是先滤波再放大,还是先放大再滤波?
ADIForum
on Oct 24, 2013
如题,如何选择正确的ADC 输入端:是先滤波再放大,还是先放大再滤波呢?欢迎大家根据您的经验讨论哦
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ADIForum
Mar 24, 2014
+3
suggested
微博网友 @lfine 的观点,分享出来供大家参考: 信噪比较高的信号可以先放大,后滤波。如果是很弱的信号淹没在强大的带外噪声中,先放大可能造成严重非线性失真,甚至阻塞,产生大量互调成份难以滤除。这时要先用带通滤波滤除强带外干扰再放大。
ADIForum
Oct 30, 2013
+2
verified
ADI亚洲技术支持中心的同事们给出的建议是——一般是先放大再滤波,这样经过放大器带来的噪声也可以被滤除。您怎么看?
冯立波
Nov 14, 2013
+2
还是应该具体问题具体分析吧。 比如几乎所有的射频输入电路都是先滤波的,否则空间的杂散信号过大,并且不可预见,会导致后端的放大器饱和甚至损坏。 如果在系统内部的信号,比如对于ADC前端的信号处理,很可能是先放大后滤波,因为杂散可预见,并且干扰信号相对比较小,不会导致放大器性能下降。 ADI专家直接给一个不论情况的答案,不太合适吧。
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zw_whu
on Oct 28, 2013 12:17 PM
各路大神的经验之谈果然让人有一种醍醐灌顶的赶脚!学习了!
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zw_whu
on Oct 28, 2013 12:17 PM
各路大神的经验之谈果然让人有一种醍醐灌顶的赶脚!学习了!
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