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1
Content available Upgraded low voltage analog Current-to-Voltage converter with negative feedback
Wojtyna R.
International Journal of Microelectronics and Computer Science
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2017
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Vol. 8, nr 2
80--84
EN
In this paper, an improved version of a current to voltage (C-V) converter is proposed. As compared to the previous version, the number of used transistors has been reduced by 1 and equals 7. The main results of this change are: an improvement of the circuit transfer function linearity, reduction the converter input resistance and decrease of the required supply voltage. Improvements in the considered converter results not only from the reduction of the number of the used transistors but also from the proposed realization of the feedback loop. In this way, it was possibly to get a strong loop gain. As a results, the achieved minimum supply voltage has been reduces from 2V, in case of the previous published converter version, to as low level as 1.2 V, in the case of the newly proposed solution. As for the linearity of the C-V transfer function, apart from its strong loop gain, an important role play also output transistors operating in a small drain to source region (linear region). Working in this region, one obtains a quasi linear voltage to current relationship. The theoretical and simulation results are in a good agreement and are promising.
2
Content available remote Filter network of dynamic nonstationary elements
Kaszyński R., Sztandera A., Wiechetek K.
Przegląd Elektrotechniczny
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2016
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R. 92, nr 11
119--123
EN
In this paper a concept of creating fast nonstationary filters based on 1-st order high-pass and low-pass elements with time-varying parameters is presented. Implementing time-varying parameters in the form of gain function and time function enables shortening of the transient state, which results in their high utility in creation of complex filter structures. Computer simulation and research on these selected structures were conducted with previously established frequency characteristics.
PL
W artykule przedstawiono koncepcję tworzenia szybkich filtrów niestacjonarnych z elementów I-go rzędu o zmiennych parametrach, które są elementami dolnoprzepustowymi i górnoprzepustowymi. Wprowadzone zmienne w czasie parametry w postaci funkcji wzmocnienia i funkcji czasowych pozwoliły wielokrotnie skrócić stany nieustalone, co spowodowało ich dużą przydatność w tworzeniu rozbudowanych struktur filtrów. Przeprowadzono badania symulacyjne struktur o wybranych, z góry założonych właściwościach częstotliwościowych.
3
Content available Power-saving voltage-to-current conversion with the use of CMOS differential amplifier
Wojtyna R.
International Journal of Microelectronics and Computer Science
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2015
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Vol. 6, nr 3
96--101
EN
Differential amplifiers are well known as input stage preamplifiers. This is because they exhibit the ability to reduce unwanted common-mode effects considerably. As a consequence, both noise and input signal of the amplifier can have low values. Proper operation of differential amplifiers is possible when implemented in chip form. For typical use of such CMOS amplifiers, input signals are delivered to differential-pair gate-terminals while tail terminal is used to ensure the required bias of the pair. The paper shows that the roles of gates and tail terminal can be changed. In other words, the tail current can be used as input signal while the gate ones as voltages controlling the amplifier gain. This enables to combine the achievable low noise with power efficient operation of the circuit. Necessary conditions for that are discussed in this paper. Suitability of atypically used differential amplifiers for voltage-to-current conversion is explained. Two examples of CMOS circuits implementing power economic conversion of this type are presented.
4
Content available Analog Reconfirable Circuits
Malcher A., Falkowski P.
International Journal of Electronics and Telecommunications
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2014
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Vol. 60, No. 1
15-26
EN
The aim of this paper is to present an overview of a new branch of analog electronics represented by analog reconfigurable circuits. The reconfiguration of analog circuits has been known and used since the beginnings of electronics, but the universal reconfigurable circuits called Field Programmable Analog Arrays (FPAA) have been developed over the last two decades. This paper presents the classification of analog circuit reconfiguration, examples of FPAA solutions obtained as academic projects and commercially available ones, as well as some application examples of the dynamic reconfiguration of FPAA.
5
Content available remote Hybrydowy ośmiowejściowy wzmacniacz operacyjny w układach analogowych z jego zastosowaniem
Holan P.
Prace Naukowe Politechniki Śląskiej. Elektryka
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2011
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z. 2
101-111
PL
W pracy przedstawiono ideę oraz praktyczną realizację ośmiowejściowego wzmacniacza operacyjnego wykonanego w technologii hybrydowej. Zaproponowano jego prosty jednobiegunowy makromodel złożony z idealnych elementów obwodowych. Opisano proste układy z wykorzystaniem ośmiowejściowego wzmacniacza operacyjnego bez i z dodatkowymi elementami zewnętrznymi. Przedstawiono wyniki pomiarów laboratoryjnych wybranych układów analogowych z jego zastosowaniem.
EN
The paper presents idea and practical of realizations eight-input operational amplifier of hybrid integrated circuit (HIC). There is proposed simple one pole macromodel of ideal circuit elements. There are described simple circuits based on eight-input operational amplifier with and/or without external elements. The results of measurements for analogues circuits basing on HIC-MIOA have been shown.
6
Content available Metal detector excited by frequency-swept signal
Svatoš J., Vedral J., Fexa P.
Metrology and Measurement Systems
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2011
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Vol. 18, nr 1
57-67
EN
This paper describes the theoretical background of electromagnetic induction from metal objects modelling. The response function of a specific case of object shape - a homogenous sphere from ferromagnetic and nonferromagnetic material is introduced. Experimental data measured by a metal detector excited with a linearly frequency-swept signal are presented. As a testing target various spheres from different materials and sizes were used. These results should lead to better identification of the buried object.
7
Content available Analytical synthesis of parameter-varying filter of constant component with application to switching systems
Piskorowski J., Kaszyński R.
Metrology and Measurement Systems
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2011
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Vol. 18, nr 3
471-480
EN
In this paper, we propose a concept of a continuous-time filter of constant component that exhibits a very short response in the time domain if compared to the traditional time-invariant filter. The improvement of the filter dynamics was achieved as a result of the time-varying parameters which were introduced to the filter structure. Such a designed filter is then applied in a system which switches many distorted signals which should be filtered as fast as possible. The paper is of review nature and presents both a theoretical background of the proposed filter and the results of simulations.
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