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A CMOS controllable constant-power source for variable resistive loads is presented. Its operation is based on the resistive mirror which keeps the equality of the resistive original resistance and the resistive image resistance. Stability requirements are in accordance with the requirements of the basic approach itself enabling large load resistance dynamic range. Two designs are considered. Prototypes based on discrete components have been experimentally verified. Relative errors of the generated power with the discrete values in the range from 0.48 to 10.8 mW, for the load resistance range from 0.5 to 1.5 kQ, are smaller than 2.2%. Also, for the generated power of 6 mW, the load resistance range from 0.2 to 5.6 kQ with the relative error smaller than 0.7% has been achieved.