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    Wyświetlanie 1-3 z 3
    Tytuł:
    Power-saving voltage-to-current conversion with the use of CMOS differential amplifier
    Autorzy:
    Wojtyna, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/398104.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    analog signal processing
    differential amplifier
    CMOS electronics
    low-power analog circuits
    analogowe przetwarzanie sygnałów
    wzmacniacz różnicowy
    CMOS
    obwody niskiego napięcia
    Opis:
    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.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2015, 6, 3; 96-101
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Upgraded low voltage analog Current-to-Voltage converter with negative feedback
    Autorzy:
    Wojtyna, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/397781.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    analog signal processing
    current-to-voltage converters
    feedback theory
    analog CMOS electronics
    analogowe przetwarzanie sygnałów
    przetworniki prądowo-napięciowe
    teoria sprzężenia zwrotnego
    CMOS
    Opis:
    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.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2017, 8, 2; 80-84
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A MOSFET only, step-up DC DC micro power converter, for solar energy harvesting applications
    Autorzy:
    Carvalho, C.
    Paulino, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/398057.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    układy CMOS
    elektronika
    energia zbiorów
    układy zarządzania energią
    komórki fotowoltaiczne
    CMOS circuits
    electronics
    energy harvesting
    power management circuits
    PV cells
    Opis:
    In this paper, a step-up micro power converter for solar energy harvesting applications is presented. The circuit is based on a switched-capacitor voltage doubler architecture with MOSFET capacitors, which results in an area approximately eight times smaller than using MiM capacitors for the 0.13 žm CMOS technology. In order to compensate for the loss of efficiency, due to the larger parasitic capacitances, a charge reutilization scheme is employed. The circuit uses a phase controller, designed specifically to work with the series of two PV cells, in order to regulate the output voltage to 1.2 V. Electrical simulations of the circuit, together with an equivalent electrical model of a PV cell, show that the circuit can deliver a power of 536.1 žW to the load, while drawing a power of 799.8 žW from two PV cells stacked in series, corresponding to a maximum efficiency of 67%.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2010, 1, 2; 112-119
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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