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2 International Journal of Microelectronics and Computer Science

2 2010

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Signal flow graph block approach to the design of the universal mixed-mode multi-loop filter and study of non-ideal properties

Sotner R., Slezak J., Dostal T., Frydrych J.

International Journal of Microelectronics and Computer Science

2010

Vol. 1, nr 3

316-325

The paper deals with the universal active filter design in current mode based on diamond transistors is presented. Circuit has abilities to work in high frequency range and adjustable features. All types of second order transfer functions are available. Theoretical assumptions are supported by simulation results in PSpice and by laboratory measurements. Impact of real substantial non-idealities caused by real active elements is discussed.

Application of digital potentiometers in multifunctional active filters at frequencies above 1 MHz

Ševčík B., Brančík L.

International Journal of Microelectronics and Computer Science

2010

Vol. 1, nr 2

138-146

The practical performance results of digital potentiometers compared with Spice-based macro model at frequencies above 1 MHz are discussed in the paper. Verification and validation checks have been performed on the new Spice compatible macromodel developed on the basis of extensive testing of the models behavior from different reputable companies such as Maxim, Analog Devices, Intersil, Texas Instrument, etc. The real properties of these digital devices are compared in several types of programmable universal active filters. Subsequently the possibilities of using chain structure for the creating of a digital potentiometer with high resolution and applicable to frequencies exceeding 1MHz frequency band are presented. Finally, the control software is introduced.