The internal simplified circuit of the digital potentiometer connects n resistors with the same resistance value in series, and both ends of each resistor are connected through an analog switch composed of a MOS tube as a tap of the digital potentiometer. This analog switch is equivalent to a single-pole, single-throw switch, and only one analog switch can be closed at a time under the control of a digital signal, thereby connecting each node of the series resistor to the wiper.
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The following is a circuit diagram of the [simplified circuit inside the digital potentiometer] 
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