利用平衡式MLCC抑制干扰
Interference Suppression Using a Balanced MLCC
摘要 仪表放大器通常工作在噪声嘈杂的环境中,当输入放大器工作时,RF干扰的AC共模电压可能产生 DC 整流并由此引发仪表放大器输出工作点的漂移,导致大量共模噪声转化为差模噪声。使用一种平衡式多层陶瓷电容(MLCC)可以提高CMRR(共模抑制比)和防止仪表放大器中的DC整流。
关键词 平衡式多层陶瓷电容;共模抑制比;等效串联电感
Abstract Instrumentation amplifiers are often employed in hostile noise environment.
Sensor cables may pick up substantial RF radiation,particularly,if they are long and/or
not well shielded.When sensors are applied to the input of an instrumentation amplifier
AC common-mode voltages can result in DC rectification,and a consequential drift of
the output operating point of the instrument amplifier,which is the reason that common
-mode interference transform into differential-mode interference.This article compares
a traditional solution with a new solution for RFI suppression using a balanced multi-
layer ceramic capacitor (MLCC) to improve CMRR and prevent DC rectification in
instrumentation amplifiers.
Keywords balanced MLCC;CMRR;ESL
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