数字电位器的数学模型与误差分析

The mathematical model and error analysis of digitally controlled potentiometers

首先建立了数字电位器的数学模型,并阐述该数学模型在可编程增益放大器及配置数字电位器工作模式(可调电阻器模式、可调分压器模式)中的应用;然后对数字电位器的基本误差、温度误差及噪声误差作了深入分析,并给出减小误差的方法。

Firstly the potentiometers, and the paper setup the mathematical model of digitally controlled applications of the mathematical model in the programmable gain amplifier and the configuration of the digitally controlled potentiometers are expatiated, whose operation modes include adjustable resister mode and adjustable voltage divider mode. Then the paper analyses the base error, the temperature error and the noise error, and provides the method to reduce the errors that mentioned above. The mathematical mode and the analysis of the errors have great benefit in analyzing the operation characters of the digitally controlled potentiometers in analogy circuit or designing programmable analogy circuit.