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    Wyświetlanie 1-6 z 6
    Tytuł:
    FET input voltage amplifier for low frequency noise measurements
    Autorzy:
    Achtenberg, Krzysztof
    Mikołajczyk, Janusz
    Bielecki, Zbigniew
    Powiązania:
    https://bibliotekanauki.pl/articles/221854.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    low noise amplifier
    low frequency noise measurements
    field effect transistors
    FET voltage noise
    FET input amplifier
    Opis:
    The paper presents a low noise voltage FET amplifier for low frequency noise measurements. It was built using two stages of an op amp trans impedance amplifier. To reduce voltage noise, eight-paralleled low noise discrete JFETs were used in the first stage. The designed amplifier was then compared to commercial ones. Its measured value of voltage noise spectral density is around 24 nV/√Hz, 3 nV/√Hz, 0.95 nV/√Hz and 0.6 nV/√Hz at the frequency of 0.1, 1, 10 and 100 Hz, respectively. A -3dB frequency response is from ~20 mHz to ~600 kHz.
    Źródło:
    Metrology and Measurement Systems; 2020, 27, 3; 531-540
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Programmable Input Mode Instrumentation Amplifier Using Multiple Output Current Conveyors
    Autorzy:
    Pankiewicz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/221277.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    instrumentation amplifier
    current conveyor
    programmable analogue circuit
    Opis:
    In this paper a programmable input mode instrumentation amplifier (IA) utilising second generation, multiple output current conveyors and transmission gates is presented. Its main advantage is the ability to choose a voltage or current mode of inputs by setting the voltage of two configuration nodes. The presented IA is prepared as an integrated circuit block to be used alone or as a sub-block in a microcontroller or in a field programmable gate array (FPGA), which shall condition analogue signals to be next converted by an analogue-to-digital converter (ADC). IA is designed in AMS 0.35 µm CMOS technology and the power supply is 3.3 V; the power consumption is approximately 9.1 mW. A linear input range in the voltage mode reaches ± 1.68 V or ± 250 µA in current mode. A passband of the IA is above 11 MHz. The amplifier works in class A, so its current supply is almost constant and does not cause noise disturbing nearby working precision analogue circuits.
    Źródło:
    Metrology and Measurement Systems; 2017, 24, 1; 79-89
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the impact of the frequency range of the tensometer bridge and projectile geometry on the results of measurements by the split Hopkinson pressure bar method
    Autorzy:
    Moćko, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/220701.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Hopkinson bar
    tensometer bridge
    amplifier bandwidth
    strain measurement
    Opis:
    The paper presents the results of the analysis of the striker shape impact on the shape of the mechanical elastic wave generated in the Hopkinson bar. The influence of the tensometer amplifier bandwidth on the stress-strain characteristics obtained in this method was analyzed too. For the purposes of analyzing under the computing environment ABAQUS / Explicit the test bench model was created, and then the analysis of the process of dynamic deformation of the specimen with specific mechanical parameters was carried out. Based on those tests, it was found that the geometry of the end of the striker has an effect on the form of the loading wave and the spectral width of the signal of that wave. Reduction of the striker end diameter reduces unwanted oscillations, however, adversely affects the time of strain rate stabilization. It was determined for the assumed test bench configuration that a tensometric measurement system with a bandwidth equal to 50 kHz is sufficient.
    Źródło:
    Metrology and Measurement Systems; 2013, 20, 4; 555-564
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Direct Comparison of Analogue and Digital FGPA-Based Approaches to Synchronous Detection
    Autorzy:
    Teren, O.
    Tomlain, J.
    Sedlacek, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/221544.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    synchronous detection
    lock-in amplifier
    digital signal processing
    FPGA
    measurement of impedance
    Opis:
    This paper deals with a comparison between digital and analogue implementation of a synchronous detection algorithm. The commonly used implementation methods of synchronous detection are presented in the paper. The paper describes FPGA-based digital and analogue hardware approaches, focusing on the digital design. The characteristics of used analogue-to-digital converters are measured. Both proposed approaches are directly compared in terms of sensitivity and long-term stability. The achieved results, along with identified limitations and proposed improvements are widely discussed.
    Źródło:
    Metrology and Measurement Systems; 2018, 25, 1; 57-69
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    64 channel neural recording amplifier with tunable bandwidth in 180 nm CMOS technology
    Autorzy:
    Gryboś, P.
    Kmon, P.
    Żołądź, M.
    Szczygieł, R.
    Kachel, M.
    Lewandowski, M.
    Błasiak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/220527.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    neurobiological measurements
    low noise amplifier
    neural recording
    band-pass filter
    multichannel ASIC
    Opis:
    This paper presents the design and measurements of low-noise multichannel front-end electronics for recording extra-cellular neuronal signals using microelectrode arrays. The integrated circuit contains 64 readout channels and is fabricated in CMOS 180 nm technology. A single readout channel is built of an AC coupling circuit at the input, a low-noise preamplifier, a band-pass filter and a second amplifier. In order to reduce the number of output lines, the 64 analog signals from readout channels are multiplexed to a single output by an analog multiplexer. The chip is optimized for low noise and good matching performance and has the possibility of passband tuning. The low cut-off frequency can be tuned in the 1 Hz - 60 Hz range while the high cut-off frequency can be tuned in the 3.5 kHz - 15 kHz range. For the nominal gain setting at 44 dB and power dissipation per single channel of 220 žW, the equivalent input noise is in the range from 6 žV - 11 žV rms depending on the band-pass filter settings. The chip has good uniformity concerning the spread of its electrical parameters from channel to channel. The spread of the gain calculated as standard deviation to mean value is about 4.4% and the spread of the low cut-off frequency set at 1.6 Hz is only 0.07 Hz. The chip occupies 5×2.3 mm⊃2 of silicon area. To our knowledge, our solution is the first reported multichannel recording system which allows to set in each recording channel the low cut-off frequency within a single Hz with a small spread of this parameter from channel to channel. The first recordings of action potentials from the thalamus of the rat under urethane anesthesia are presented.
    Źródło:
    Metrology and Measurement Systems; 2011, 18, 4; 631-643
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Monitoring of phase jitter in fibre optic time and frequency transfer systems
    Autorzy:
    Salwik, K.
    Śliwczyński, Ł.
    Krehlik, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/221405.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    jitter measurement
    phase comparison
    fibre optics
    time and frequency transfer
    bidirectional
    optical amplifier
    Opis:
    The phase jitter enables to assess quality of signals transmitted in a bi-directional, long-distance fibre optic link dedicated for dissemination of the time and frequency signals. In the paper, we are considering measurements of jitter using a phase detector the detected frequency signal and the reference signal are supplied to. To cover the wideband jitter spectrum the detected signal frequency is divided and - because of the aliasing process - higher spectral components are shifted down. We are also examining the influence of a residual jitter that occurs in the reference signal generated by filtering the jitter occurring in the same signal, whose phase fluctuations we intend to measure. Then, we are discussing the evaluation results, which were obtained by using the target fibre optic time and frequency transfer system.
    Źródło:
    Metrology and Measurement Systems; 2018, 25, 3; 487-497
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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