基于電流取樣調(diào)制的電阻低頻噪聲測(cè)試方法
發(fā)布時(shí)間:2018-10-23 06:31
【摘要】:針對(duì)現(xiàn)有電阻低頻噪聲測(cè)試技術(shù)的不足,提出了基于直流偏置和電流取樣調(diào)制的噪聲測(cè)試新方法。采用跨阻前置放大器對(duì)被測(cè)電阻噪聲電流取樣,采用交叉開(kāi)關(guān)對(duì)取樣的噪聲電流進(jìn)行調(diào)制。前置放大器的低頻噪聲電流和噪聲電壓不會(huì)受到調(diào)制,被測(cè)電阻低頻噪聲被調(diào)制到較高頻率處。采用高通濾波有效抑制放大電路的低頻噪聲,以便提高放大電路的增益。采用同步相敏檢測(cè)和低通濾波,進(jìn)一步抑制放大電路的低頻噪聲,從而準(zhǔn)確地檢測(cè)被測(cè)電阻低頻噪聲。理論和實(shí)驗(yàn)結(jié)果表明:所提出的方法能夠獲得較高的電阻低頻噪聲測(cè)試分辨率,并準(zhǔn)確地反映直流偏置下的電阻噪聲特性。
[Abstract]:A new noise measurement method based on DC bias and current sampling modulation is proposed. The noise current of the measured resistor is sampled by the transresistance preamplifier and the noise current of the sample is modulated by the cross switch. The low-frequency noise current and the noise voltage of the preamplifier are not modulated, and the low-frequency noise of the measured resistor is modulated to a higher frequency. The high pass filter is used to suppress the low frequency noise of the amplifier circuit effectively, so as to improve the gain of the amplifier circuit. The low frequency noise of the amplifier circuit is further suppressed by using synchronous phase sensitive detection and low pass filter, and the low frequency noise of the measured resistor is detected accurately. Theoretical and experimental results show that the proposed method can obtain high resolution of low frequency noise measurement and accurately reflect the characteristics of resistance noise under DC bias.
【作者單位】: 上海海事大學(xué)物流工程學(xué)院;邢臺(tái)職業(yè)技術(shù)學(xué)院;上海奧波電子有限公司;國(guó)家核電國(guó)核工程有限公司;
【分類(lèi)號(hào)】:TN606
本文編號(hào):2288281
[Abstract]:A new noise measurement method based on DC bias and current sampling modulation is proposed. The noise current of the measured resistor is sampled by the transresistance preamplifier and the noise current of the sample is modulated by the cross switch. The low-frequency noise current and the noise voltage of the preamplifier are not modulated, and the low-frequency noise of the measured resistor is modulated to a higher frequency. The high pass filter is used to suppress the low frequency noise of the amplifier circuit effectively, so as to improve the gain of the amplifier circuit. The low frequency noise of the amplifier circuit is further suppressed by using synchronous phase sensitive detection and low pass filter, and the low frequency noise of the measured resistor is detected accurately. Theoretical and experimental results show that the proposed method can obtain high resolution of low frequency noise measurement and accurately reflect the characteristics of resistance noise under DC bias.
【作者單位】: 上海海事大學(xué)物流工程學(xué)院;邢臺(tái)職業(yè)技術(shù)學(xué)院;上海奧波電子有限公司;國(guó)家核電國(guó)核工程有限公司;
【分類(lèi)號(hào)】:TN606
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