详细介绍
WATLOW 96B1-CDDM-00RR
WATLOW 96B1-CDDM-00RR
我们简化THD+N计算来去除失真项:
我们可以用如下方程式来近似计算一个基本运算放大器电路的RMS噪声电压:
AN 是“噪声增益”,eN是运算放大器宽带电压噪声频谱密度,而BWN是测量噪声时的带宽。噪声增益,或者说是放大器对其固有噪声的增加,始终在运算放大器的非反向输入上测得。当运算放大器被用作非反向放大器时,这种方法简单且直接;信号增益与噪声增益是一样的。然而,对于反向放大器,噪声增益将为信号增益的幅值加上1。例如,信号增益为-1的反向放大器具有+2的噪声增益。
OPA316有一个11nV/√Hz的宽带输入电压噪声频谱密度,并且测量带宽的额定值为80kHz。对于非反向放大器 (G = +1),RMS噪声电压大约为:
对于反向放大器(增益 = -1),RMS噪声电压为:
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