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首页> 外文会议>International Siberian Conference on Control and Communications >Universal Programmable DC Amplifier for Low Frequency Noise Measurements
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Universal Programmable DC Amplifier for Low Frequency Noise Measurements

机译：通用可编程直流放大器，用于低频噪声测量

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The article describes the functional and circuit implementation of a universal low-noise DC amplifier designed to measure low-frequency noise in complex multi-channel measurement systems. The main advantage of the amplifier is the possibility of external remote control using the popular RS-485 interface, as well as the ability to use built-in zero offset correction algorithms and automatic drift compensation, while maintaining high performance characteristics. A built-in microcontroller with an efficient protocol and a command line interface allows the amplifier to be used as a separate unit, or as an element of the measuring channel with a cascade connection of blocks with the combination of functions. This paper presents the experimental setup for measuring and analyzing the noise of digital potentiometers, which are the main adjusting elements of the amplifier. It is shown that the noise of these electronic components slightly exceeds the noise of resistors with similar values of resistance. Automatic gain control using a MCU unit eliminates the problem of possible over-current digital potentiometer with a large dynamic range of input signal. Using the built-in filter on switchable capacitors controlled by a MCU unit allows you to effectively limit the bandwidth of the measuring path. The voltage gain of the developed prototype amplifier has a range Ku = 5 ÷ 100, the equivalent noise level at 1kHz does not exceed 1.14·10-9 nV/√Hz.
机译：本文介绍了通用低噪声DC放大器的功能和电路实现，该放大器旨在测量复杂的多通道测量系统中的低频噪声。放大器的主要优点是可以使用流行的RS-485接口进行外部远程控制，并且可以使用内置的零偏移校正算法和自动漂移补偿，同时保持高性能。具有高效协议和命令行界面的内置微控制器，可以将放大器用作单独的单元，也可以用作功能块组合的模块级联连接的测量通道的元素。本文介绍了用于测量和分析数字电位器噪声的实验装置，数字电位器是放大器的主要调节元件。结果表明，这些电子元件的噪声略大于具有相似电阻值的电阻器的噪声。使用MCU单元的自动增益控制消除了输入信号动态范围较大时可能出现的过电流数字电位器的问题。在MCU单元控制的可切换电容器上使用内置滤波器，可以有效限制测量路径的带宽。开发的原型放大器的电压增益范围为K u = 5÷100，1kHz时的等效噪声水平不超过1.14·10 -9 nV /√Hz。

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