On the basis of this control mode, another digital potentiometer circuit for weak current adjusting was designed and a switch circuit was designed to shift form one mode to the other.

• 课题在原有小电流信号手调电位器控制的基础上添加了数字电位器控制方式,并设计了一个切换开关电路用于这两种控制方式之间的切换。