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Thank you for your suggestions. But my goal is to design Programmable Power Supply with the output voltage range from 1V to 130V (with 0.1V step unit). In my circuit I am using LTC7138 Step-Down Regulator (here bellow you can find the picture of it). Firstly I thought to use 10 bit digital rheostat instead of R2, but so far as Vout = 0.8(1+R1/R2), my output voltage cannot be changed linearly. Then I decided to use N-channel mosfet instead of R2 (Ron of transistor is reversely proportional to Vgs voltage, and hence Vout of regulator will be directly proportional to Vgs). But that linear range of mosfet is very poor,and it is not arrange m. So now I do not know how to solve this problem.View attachment 141330