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数控电位器(DCP)的关键参数是抽头个数n,即电刷的可编程位置的个数。在可编程的电流和电压应用中,此参数确定电位器的分辨力。现有多种电路方法,它们只用一个或多个具有额定抽头数的数字控制电位器,就可提高电位器的分辨力。图1所示电路对提高可编程电压应用场合的分辨力,在理论上是没有限制的。IC_3放大器电路是一个具有加权输入
The key parameters of the digital potentiometer (DCP) are the number of taps n, which is the number of programmable positions of the brushes. In programmable current and voltage applications, this parameter determines the resolution of the potentiometer. There are a variety of circuit methods available that use only one or more digitally controlled potentiometers with a nominal number of taps to improve potentiometer resolution. The circuit shown in Figure 1 to improve the resolution of programmable voltage applications, in theory there is no limit. The IC_3 amplifier circuit is a weighted input