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关于低噪声运放的输入噪声密度与温度的关系

zhangyu
on May 4, 2014

     各位好，我从事测井仪器研发，仪器最高可工作于175度高温环境，且测量精度要求较高，我想了解低噪声运放的输入噪声密度与温度的关系。我司主要用到的运放如AD8599,AD8676,AD8620等，在运放的数据手册里没有这类相关信息，多谢!

     另外，我实测了一下，做一个同样比例放大器，输入为0，放大1000倍用示波器查看噪声，然后用烙铁头给运放适点加热，发现噪声水平并无明增加。

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    •  Analog Employees 
    on May 6, 2014 11:58 AM

    您的问题已经通过china.support@analog.com邮箱回复。

    您挑选的这几款芯片支持的工作温度范围是-40C~125C，这类型的产品手册里面都没有定义噪声和温度的关系。如果是井下高温工作的话，建议您选择工作温度可以到175C的高温器件，目前我们有的高温器件型号有ADXL206，ADT7312，ADR225， AD8634和AD8229. AD8634的数据手册中给出的噪声谱密度参数是在210C下测得的。

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  • 0
    •  Analog Employees 
    on May 6, 2014 11:58 AM

    您的问题已经通过china.support@analog.com邮箱回复。

    您挑选的这几款芯片支持的工作温度范围是-40C~125C，这类型的产品手册里面都没有定义噪声和温度的关系。如果是井下高温工作的话，建议您选择工作温度可以到175C的高温器件，目前我们有的高温器件型号有ADXL206，ADT7312，ADR225， AD8634和AD8229. AD8634的数据手册中给出的噪声谱密度参数是在210C下测得的。

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