Modeling and signal integrity testing of digital potentiometers

This paper describes the practical results of the performance of digital potentiometers in comparison with Spice-based macro model for frequencies of several MHz. Verification and validation checks have been performed on the new Spice compatible macro model developed on the basis of extensive testing of the behavior models from different reputable companies such as Maxim, Analog Devices, Intersil, etc. The real system performance conditions are tested on programmable universal active filter. Subsequently are testing the possibility of using chain structure for the creating of digital potentiometer with high resolution and applicable to frequencies exceeding 1 MHz frequency band. Finally, the control software is introduced.