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一、概述炭膜电位器的噪声可分静态噪声和动态噪声两部分.静态噪声又包括热噪声和电流噪声.热噪声是由于炭膜本身带电质点的热骚动而引起的,是一种不可抑止的物理现象,其值是微伏量级,可用下式表示: ?? 式中:U_t为电位器两端的热噪声电压(有效值),T为绝对温度,K为波尔兹曼常数,R(ω)为电阻的频率函数式,ω_2、ω_1为角频率的上下限. 炭膜电位器的膜层是由颗粒状结构组成的导电
First, an overview of the carbon membrane potentiometer noise can be divided into static noise and dynamic noise in two parts.Static noise and thermal noise and current noise.Cover noise is due to the carbon membrane itself caused by thermal disturbance of the quality of the particles, is an unquenchable Of the physical phenomenon, the value is micro-volt level, can be expressed as follows: Where: U_t for the potentiometer across the thermal noise voltage (RMS), T absolute temperature, K Boltzmann constant, R (ω) is the frequency function of the resistance, ω_2, ω_1 is the upper and lower limits of the angular frequency. Carbon film potentiometer membrane is composed of granular structure of the conductive