2021 44th International Convention on Information, Communication and Electronic Technology (MIPRO), 2021
Most of the research on fractional-order (FO) systems has been presented for passive realization ... more Most of the research on fractional-order (FO) systems has been presented for passive realization of FO capacitors and inductors. In this paper, an active realization of a FO capacitor or a constant-phase element (CPE) is presented in the form which can be realized as an integrated circuit. The realization is demonstrated using OTA-C structures in AMS 0.35um C35B4 technology. We propose the realization of active constant phase elements using OTAs having MOS transistors in the saturation region. The linearization of each OTA is applied by source degeneration. We use standard approximation such as second-order continuous fraction expansion (CFE) to design three non-integer orders of 1/3, 1/2 and 2/3. We propose tuning method using different bias currents of OTAs to obtain desired phase characteristics of the CPE.
This paper presents the realization of third-order low-pass (LP) active-RC filters using new simp... more This paper presents the realization of third-order low-pass (LP) active-RC filters using new simplified Leap-Frog (LF) topology. It has the reduced number of components, reduced complexity and straightforward design procedure. It is well known that the passive ladder-RLC filters, terminated with equal resistors at both ends have very low sensitivity to component tolerances in the pass-band. If active-RC filter are
This paper presents the measurement methods of power consumption, output noise spectrum and Bode ... more This paper presents the measurement methods of power consumption, output noise spectrum and Bode diagram. The power consumption is measured through supply current using a 'FLUKE 289 True RMS Multimeter'. The output thermal noise spectral density and Bode diagrams are measured using high-quality equipment consisting of 'Network Analyzer HP 4195A' and computer. The measured data are downloaded from Network Analyzer
2014 37th International Convention on Information and Communication Technology, Electronics and Microelectronics (MIPRO), 2014
ABSTRACT In this paper the model of a system for measuring small currents, which generates the di... more ABSTRACT In this paper the model of a system for measuring small currents, which generates the digital signal proportional to the input current, was designed. The analysed measuring system is the part of a larger microelectronic mixed-signal integrated chip (SoC -System on Chip), and it is located between the input sensor and the external digital device. Since the part that mostly contributes to the noise inside the whole measuring chain is at the input of the chain, the measurement method is analyzed to minimize the impact of noise. Because the noise is not definite, the simulation of measurement by the model was made using statistical principles. Performing multiple measurements of the input value (in our example it is current Id) it is possible to calculate its mean value and standard deviation. It was shown that the measured quantity can be calculated from the mean value and that the standard deviation represents an amount of noise. Depending on the standard deviation it is needed to do either less or more sequential measurements to determine the reliable measured output digital value.
ABSTRACT In this paper a method of realizing seventh-order elliptic filter using signal-flow grap... more ABSTRACT In this paper a method of realizing seventh-order elliptic filter using signal-flow graphs is presented. The elliptic filter having a minimum number of capacitors is compared with the filter having a higher number of capacitors. The version with minimum number of capacitors provides area savings in IC form. Both filters (i.e. filter with minimum and one with higher number of capacitors) have a low sensitivity to component tolerances in the pass band according to Orchard's theorem. The seventh-order elliptic filter has three parallel capacitors forming three parallel tanks, and therefore has three finite elliptic transfer-function zeros. The realizations of one and two parallel capacitors have already been presented elsewhere. The sfg derivations necessary to realize seventh-order filter having additional resistive network is presented, which is very complicated in the case of three zeros. Transfer function magnitudes are simulated using the PSpice program. Monte Carlo runs confirm the low sensitivity to component tolerances of both circuit types.
2021 44th International Convention on Information, Communication and Electronic Technology (MIPRO), 2021
Most of the research on fractional-order (FO) systems has been presented for passive realization ... more Most of the research on fractional-order (FO) systems has been presented for passive realization of FO capacitors and inductors. In this paper, an active realization of a FO capacitor or a constant-phase element (CPE) is presented in the form which can be realized as an integrated circuit. The realization is demonstrated using OTA-C structures in AMS 0.35um C35B4 technology. We propose the realization of active constant phase elements using OTAs having MOS transistors in the saturation region. The linearization of each OTA is applied by source degeneration. We use standard approximation such as second-order continuous fraction expansion (CFE) to design three non-integer orders of 1/3, 1/2 and 2/3. We propose tuning method using different bias currents of OTAs to obtain desired phase characteristics of the CPE.
This paper presents the realization of third-order low-pass (LP) active-RC filters using new simp... more This paper presents the realization of third-order low-pass (LP) active-RC filters using new simplified Leap-Frog (LF) topology. It has the reduced number of components, reduced complexity and straightforward design procedure. It is well known that the passive ladder-RLC filters, terminated with equal resistors at both ends have very low sensitivity to component tolerances in the pass-band. If active-RC filter are
This paper presents the measurement methods of power consumption, output noise spectrum and Bode ... more This paper presents the measurement methods of power consumption, output noise spectrum and Bode diagram. The power consumption is measured through supply current using a 'FLUKE 289 True RMS Multimeter'. The output thermal noise spectral density and Bode diagrams are measured using high-quality equipment consisting of 'Network Analyzer HP 4195A' and computer. The measured data are downloaded from Network Analyzer
2014 37th International Convention on Information and Communication Technology, Electronics and Microelectronics (MIPRO), 2014
ABSTRACT In this paper the model of a system for measuring small currents, which generates the di... more ABSTRACT In this paper the model of a system for measuring small currents, which generates the digital signal proportional to the input current, was designed. The analysed measuring system is the part of a larger microelectronic mixed-signal integrated chip (SoC -System on Chip), and it is located between the input sensor and the external digital device. Since the part that mostly contributes to the noise inside the whole measuring chain is at the input of the chain, the measurement method is analyzed to minimize the impact of noise. Because the noise is not definite, the simulation of measurement by the model was made using statistical principles. Performing multiple measurements of the input value (in our example it is current Id) it is possible to calculate its mean value and standard deviation. It was shown that the measured quantity can be calculated from the mean value and that the standard deviation represents an amount of noise. Depending on the standard deviation it is needed to do either less or more sequential measurements to determine the reliable measured output digital value.
ABSTRACT In this paper a method of realizing seventh-order elliptic filter using signal-flow grap... more ABSTRACT In this paper a method of realizing seventh-order elliptic filter using signal-flow graphs is presented. The elliptic filter having a minimum number of capacitors is compared with the filter having a higher number of capacitors. The version with minimum number of capacitors provides area savings in IC form. Both filters (i.e. filter with minimum and one with higher number of capacitors) have a low sensitivity to component tolerances in the pass band according to Orchard's theorem. The seventh-order elliptic filter has three parallel capacitors forming three parallel tanks, and therefore has three finite elliptic transfer-function zeros. The realizations of one and two parallel capacitors have already been presented elsewhere. The sfg derivations necessary to realize seventh-order filter having additional resistive network is presented, which is very complicated in the case of three zeros. Transfer function magnitudes are simulated using the PSpice program. Monte Carlo runs confirm the low sensitivity to component tolerances of both circuit types.
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Papers by Drazen Jurisic