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Zastosowanie technologii cyfrowego przetwarzania sygnałów w nowoczesnych układach reograficznych

Szmajda Mirosław, Khoma Volodymyr, Khoma Yuriy, Otenko Viktor

Przegląd Elektrotechniczny

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2019

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R. 95, nr 11

233--239

PL

W pracy opisano sposób budowy układu reograficznego, bazującego na szerokim wykorzystaniu układów cyfrowych w celu zapewnienia stabilności parametrów toru pomiarowego oraz rozszerzenia jego funkcyjności. Nowe rozwiązanie dotyczy kompensacji oporu bazowego za pomocą potencjometru cyfrowego, cyfrowej syntezy kwadraturowych sygnałów pobudzenia oraz wykonania detekcji synchronicznej w postaci cyfrowej.

EN

This paper describes a method of rheographic system design, that is based on the wide use of digital components in order to ensure the stability of the measuring channel parameters as well as expanding its functionality. A novel approach concerns the compensation of the base resistance using a digital potentiometer, digital synthesis of quadrature probe signals and the implementation of synchronous detection in a digital form.

2

Analysis and simulation modeling of programmable circuits using digital potentiometers

Pandiev I. M

International Journal of Microelectronics and Computer Science

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2014

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Vol. 5, nr 4

127--135

EN

In this paper an object of analysis and simulation modeling are the basic programmable circuits using CMOS digital potentiometers or Resistive Digital-to-Analog Converters (RDACs). Based on the analysis and principle of operation an improved SPICE-based behavioral model for RDAC potentiometers is created. The model accurately reﬂects resolution (wiper steps), nominal end-to-end resistance, wiper resistance, linear and nonlinear increment/decrement of the wiper, common-mode leakage current, operating bandwidth, analog crosstalk, temperature coefficients and noise effects. Model parameters are extracted for the dual RDAC potentiometer AD5235 from Analog Devices as an example. The workability of the proposed simulation model is verified by simulation modeling and experimental testing of sample electronic circuits.

3

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

Ševčík B., Brančík L.

International Journal of Microelectronics and Computer Science

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2010

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Vol. 1, nr 2

138-146

EN

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.