詳細(xì)介紹
WATLOW 96B1-CDDM-00RR
WATLOW 96B1-CDDM-00RR
我們簡化THD+N計(jì)算來去除失真項(xiàng):
我們可以用如下方程式來近似計(jì)算一個(gè)基本運(yùn)算放大器電路的RMS噪聲電壓:
AN 是“噪聲增益”,eN是運(yùn)算放大器寬帶電壓噪聲頻譜密度,而BWN是測(cè)量噪聲時(shí)的帶寬。噪聲增益,或者說是放大器對(duì)其固有噪聲的增加,始終在運(yùn)算放大器的非反向輸入上測(cè)得。當(dāng)運(yùn)算放大器被用作非反向放大器時(shí),這種方法簡單且直接;信號(hào)增益與噪聲增益是一樣的。然而,對(duì)于反向放大器,噪聲增益將為信號(hào)增益的幅值加上1。例如,信號(hào)增益為-1的反向放大器具有+2的噪聲增益。
OPA316有一個(gè)11nV/√Hz的寬帶輸入電壓噪聲頻譜密度,并且測(cè)量帶寬的額定值為80kHz。對(duì)于非反向放大器 (G = +1),RMS噪聲電壓大約為:
對(duì)于反向放大器(增益 = -1),RMS噪聲電壓為:
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