Temat: ampliﬁer - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Simply and low coast electromyography signal amplifier
Niskobudżetowy wzmacniacz sygnału elektromiograficznego
Autorzy:: Barański, R.
Grzeczka, A.
Powiązania:: https://bibliotekanauki.pl/articles/329362.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:: EMG amplifier
electromyography amplifier
bioelectric amplifier
wzmacniacz EMG
wzmacniacz elektromiograficzny
wzmacniacz sygnału bioelektrycznego
Opis:: Recently, there has been a noticeable increase in interest in solutions utilizing electrical signals accompanying muscle activity. Electromyography (EMG) is a technique for recording, analysis and evaluating the electrical activity produced by striated muscle. Its great popularity is due, among other, to the ability to measure with non-invasive electrodes (called as sEMG surface electromyography). However, the limitations of this method are the high costs of specialized measuring equipment, and in particular the systems of bioelectric signal preamplifier circuits. The work presents the design of a low budget EMG signal amplifier. It has been designed and validated in accordance with ISEK (International Society of Electrophysiology and Kinesiology) and SENIAM (Surface ElectroMyGraphy for Non-Invasive Assessment of Muscles).
W ostatnim czasie zauważalny jest znaczny wzrost zainteresowań rozwiązaniami wykorzystującymi sygnały elektryczne towarzyszące aktywności mięśni. Za rejestrację zmian potencjałów mięśniowych, ich rejestrację oraz analizę odpowiada technika zwana elektromiografią (EMG). Jej dużą popularność wynika m.in. z możliwości pomiarów z użyciem nieinwazyjnych elektrod (czasami nazywana elektromiografią powierzchniową sEMG). Ograniczenie stanowią jednak wysokie koszty specjalistycznej aparatury pomiarowej, a w szczególności układów przedwzmacniaczy sygnałów bioelektrycznych. Praca przedstawia projekt nisko budżetowego wzmacniacza sygnałów EMG. Został on zaprojektowany i zwalidowany zgodnie z wytycznymi ISEK (International Society of Electrophysiology and Kinesiology) oraz SENIAM (Surface ElectroMyoGraphy for the Non-Invasive Assessment of Muscles).
Źródło:: Diagnostyka; 2017, 18, 4; 69-77
1641-6414
2449-5220
Pojawia się w:: Diagnostyka
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Simple three-stage frequency-stabilized diode laser system using injection-locking and tapered amplifier
Autorzy:: Szonert, Jerzy
Głódź, Małgorzata
Kowalski, Krzysztof
Powiązania:: https://bibliotekanauki.pl/articles/2063897.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:: diode laser
optical injection-locking
master oscillator power amplifier
optical limiting amplifier
tapered amplifier
Opis:: We developed a three-stage, amplifying, tunable diode laser system that comprises a master laser in a Littrow configuration, frequency-stabilized by dichroic atomic vapour laser lock, acousto-optic frequency shifter, injection-locked slave laser, and tapered amplifier. The slave amplifies the injected frequency-shifted master beam while suppressing (within 0.5%) the strong dependence of its intensity on the acousto-optic frequency shifter carrier frequency, thus acting as a strongly saturated optical limiting amplifier with constant output power. The resulting beam is then amplified in a tapered amplifier. The system provides an output power above 700 mW at a wavelength of 780 nm, with a time-averaged linewidth of 0.6 MHz, and a frequency drift below 2 MHz/h. Dichroic atomic vapour laser lock enables frequency stabilization in the range of 400 MHz around D2 lines of rubidium. The mode-hop-free tuning range amounts to 2 GHz. Determined by the acousto-optic frequency shifter model used, the fine-tuning range (recision of few tens kHz) spans 70 MHz. A description of the system was presented and its performance was tested. The basic components have been designed in our laboratory.
Źródło:: Opto-Electronics Review; 2022, 30, 1; 1--13
1230-3402
Pojawia się w:: Opto-Electronics Review
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Bulk linearized CMOS differential pair transconductor for continuous-time OTA-C filter design
Autorzy:: Pankiewicz, B.
Szczepański, S.
Wójcikowski, M.
Powiązania:: https://bibliotekanauki.pl/articles/201044.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: transconductance amplifier
OTA
bulk-driven amplifier
OTA-C filter
Opis:: In this paper, the MOS differential pair driven simultaneously from gates and bulk terminals is described. An approximated analytical solution of the voltage to current transfer function has been found for the proposed circuit. Four possible combinations of gate and bulk connections of the input signal are presented. Basing on the configuration giving the best linearity, the operational transconductance amplifier (OTA) has been designed and compared, by computer simulations, to the amplifier utilizing the gate driven classic MOS pair. 3rd order filters using the OTAs with linearized and simple MOS pair have been designed and the resulting parameters have been compared. Linearization through the presented simultaneous use of gate and bulk terminals seems to be useful for low voltage applications.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 1; 77-84
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: A review of the configuration and performance limitation parameters in optical amplifiers
Autorzy:: Ab-Rahman, M. S.
Powiązania:: https://bibliotekanauki.pl/articles/173365.pdf
Data publikacji:: 2014
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: semiconductor optical amplifiers (SOA)
erbium-doped fibre amplifier (EDFA)
Raman
amplifier
Opis:: Optical amplifiers are realised in a wide range of applications, such as metro – dense wavelength division multiplexing and cable television networks. These applications require the amplifier to provide a maximum output power level by accepting an input power near the saturation level. To obtain an ideal amplifier according to several parameters, the erbium concentration in the composite core glass, the optimum length of the fibre, the pump saturation and the input signal signaltonoise ratio must be critically studied and addressed. In this paper, we will review the types of optical amplifiers used in communication systems today as well as the parameters that limit the performance of optical amplifiers in the network, such as the noise figure, the gain saturation, the polarisation dependence gain and inhomogeneous broadening effects. Based on the performance limitation factor, we model the amplifier gain profile and the effect of the gain value on the network performance. Finally, we propose various configurations of an optical amplifier, and the advantages of each amplification technique are highlighted.
Źródło:: Optica Applicata; 2014, 44, 2; 251-266
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: A multichannel programmable distribution amplifier
Autorzy:: Różyc, K.
Kwiatkowski, P.
Sawicki, M.
Jachna, Z.
Szplet, R.
Powiązania:: https://bibliotekanauki.pl/articles/114493.pdf
Data publikacji:: 2015
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: programmable device
distribution amplifier
Opis:: This paper presents the design, operation and test results of a multichannel programmable distribution amplifier. The distributor is based on a reprogrammable device Spartan-6 FPGA (Xilinx) and is intended to distribute a 10 MHz or 5 MHz frequency reference signal as well as 1 PPS pulses. It is built in a 2U, 19” rack-mount enclosure and is equipped with a single optical and seven electrical inputs, as well as two optical and fourteen electrical outputs The transition time and additive jitter of the distribution amplifier were tested and they did not exceed 14 ns and 4.5 ps RMS (for electrical inputs/outputs), respectively. In the case of optical input/outputs, the results depend on the parameters of converters involved. The values of delays and jitter introduced by the distributor are slightly larger than for dedicated integrated circuits, but the advantage of this solution is the possibility to build signal distributors with a larger number of inputs/outputs and the ease to modify and meet requirements of various applications.
Źródło:: Measurement Automation Monitoring; 2015, 61, 7; 314-316
2450-2855
Pojawia się w:: Measurement Automation Monitoring
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Design of integrated readout circuit for NMOS THZ detectors based on chopper ampliﬁer concept
Autorzy:: Kołaciński, C
Obrębski, D.
Zagrajek, P.
Powiązania:: https://bibliotekanauki.pl/articles/397722.pdf
Data publikacji:: 2014
Wydawca:: Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
Tematy:: NMOS-based terahertz detector
chopper ampliﬁer
instrumentation amplifier
voltage controlled ampliﬁer
programmable gain ampliﬁer
readout circuit
detektor terahercowy
chopper
wzmacniacz instrumentacyjny
wzmacniacz sterowany napięciem
wzmacniacz PGA
obwód odczytujący
Opis:: This paper deals with design of readout circuit dedicated for NMOS-based terahertz detectors. The proposed architecture bases on chopper ampliﬁer and instrumentation ampliﬁer concepts. The main objectives were high gain (max. 100 dB) and proper operation with NMOS-based THz detectors. Three different architectures of measurement ampliﬁer designed for the research project are discussed in this paper. The designed chip was manufactured in AMS C35B4 process (350 nm feature size). Another issue described in this paper is dedicated, non-typical testing environment. At the end a few measurement results are shown.
Źródło:: International Journal of Microelectronics and Computer Science; 2014, 5, 1; 14-24
2080-8755
2353-9607
Pojawia się w:: International Journal of Microelectronics and Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: A novel flattened gain C-band cascaded hybrid optical Raman and thulium-doped fluoride fiber amplifier for super dense wavelength division multiplexing system
Autorzy:: Kumar, C.
Goyal, R.
Powiązania:: https://bibliotekanauki.pl/articles/174394.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: gain
noise figure
Raman amplifier
thulium-doped fluoride fiber
TDFF amplifier
super dense wavelength division multiplexing
SD-WDM
hybrid optical amplifier
Opis:: In this paper, we have reported a very advanced hybrid optical amplifier (Raman-TDFF amplifier) for the 180 × 10 Gbps super dense wavelength division multiplexing system with the channel spacing of 100 GHz. The performances of the model have been evaluated in terms of gain and noise figures for the C-band (from 1525 to 1565 nm). Gain flatness (> 21 dB) is recorded with the least variation of 2.5 dB without using any cost effective technique. Further, the effect of the proposed hybrid optical amplifier has also been analyzed with slightly shifting the wavelength spectrum for the same feature.
Źródło:: Optica Applicata; 2018, 48, 2; 173-177
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Designed Filter with CCII+ and Analysis of EEG for Epilepsy and Alzheimer
Autorzy:: Kitiş, Ş.
Apaydın, H.
Güntürkün, R.
Powiązania:: https://bibliotekanauki.pl/articles/1030098.pdf
Data publikacji:: 2017-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: CCII+
Alzheimer
epilepsy
filter
amplifier
Opis:: Biomedical signals are usually low amplitude and high bandwidth signals. EEG signals are very low amplitude (generally less than 300 μV) and very high bandwidth (range from 0.5 to 100 Hz), too. EEG was used to assist in the diagnosis of brain damage, Alzheimer disease and Parkinson disease, and certain mental disorders. In this study amplifier and filters designed with CCII+ and these simulations are performed with PSPICE program. Normal brain signal, the Alzheimer brain signal, epilepsy brain signal are compared, the shrinking hippocampus compared 25 years old normal brain, 75 years old normal brain and 75 years old with the Alzheimer brain.
Źródło:: Acta Physica Polonica A; 2017, 132, 3; 423-426
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Ambiguities in input-output behavior of driven nonlinear systems close to bifurcation
Autorzy:: Reit, M.
Berens, M.
Mathis, W.
Powiązania:: https://bibliotekanauki.pl/articles/140632.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Andronov-Hopf
bifurcation
nonlinear amplifier
ambiguities
Opis:: Since the so-called Hopf-type amplifier has become an established element in the modeling of the mammalian hearing organ, it also gets attention in the design of nonlinear amplifiers for technical applications. Due to its pure sinusoidal response to a sinusoidal input signal, the amplifier based on the normal form of the Andronov-Hopf bifurcation is a peculiar exception of nonlinear amplifiers. This feature allows an exact mathematical formulation of the input-output characteristic and thus deeper insights of the nonlinear behavior. Aside from the Hopf-type amplifier we investigate an extension of the Hopf system with focus on ambiguities, especially the separation of solution sets, and double hysteresis behavior in the input-output characteristic. Our results are validated by a DSP implementation.
Źródło:: Archives of Electrical Engineering; 2016, 65, 2; 337-347
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Design of resistor-less first-order all-pass filter using single VDVTA (Voltage Differencing Voltage Transconducatnce Amplifier)
Autorzy:: Shaktour, M.
Powiązania:: https://bibliotekanauki.pl/articles/377724.pdf
Data publikacji:: 2013
Wydawca:: Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:: VDVTA
Voltage Differencing Voltage Transconductance Amplifier
Opis:: This paper presents a new realization of a first-order mixed-mode (Voltage input Current output) (MM) all-pass filter (APF) using the recently proposed modern active building block (ABB), namely the Voltage Differencing Voltage Transconductance Amplifier (VDVTA). The MM APF is made using minimum number of components, namely a single VDVTA and one grounded capacitor. The circuit does not use any external resistors and offers the advantages of current-tunable pole frequency, low input impedance and high output impedance. PSPICE simulation results are included to verify the workability of the circuit.
Źródło:: Poznan University of Technology Academic Journals. Electrical Engineering; 2013, 76; 271-274
1897-0737
Pojawia się w:: Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Derivation of Closed-Form Design Equations for Idealized Operation of Inverse Class-E Power Amplifiers at Any Duty Ratio
Autorzy:: Wang, Y.
Foo, S. K.
He, Q.
Powiązania:: https://bibliotekanauki.pl/articles/226130.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Class E
power amplifier
numerical simulation
Opis:: Complementary to the conventional class-E topology, inverse class-E operation has several advantages over the class-E counterpart, such as lower peak switch voltage and smaller circuit inductance, which are attractive to high power RF design and MMIC implementation. This paper derives the closed-form design equations that can be used to synthesize the idealized operation of inverse class-E power amplifiers at any switch duty ratio. Calculation of the key design parameters, such as the maximum switch voltage and circuit components values, is elaborated and compared with the case of conventional class-E operation. Further, the theoretical analysis is confirmed and verified by numerical simulations performed on a 500mW, 2.4 GHz idealized inverse class-E power amplifier.
Źródło:: International Journal of Electronics and Telecommunications; 2015, 61, 3; 281-287
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Examination of hydraulic amplifiers in the aspect of lifetime prediction
Autorzy:: Jastrzębski, G.
Ułanowicz, L.
Powiązania:: https://bibliotekanauki.pl/articles/244003.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: hydraulic amplifier
distributing slider
hydrodynamic radial force
insensitivity (dead) zone of a hydraulic amplifier
durability (lifetime)
Opis:: The paper presents the lifetime analysis for a hydraulic amplifier and considers two types of the flow distributing devices, i.e. a linear distributings lider and a rotarys lider. Description of essential properties associated with operation of distributing devices in hydraulic amplifiers is included with particular attention to analysis of processes that affect wear and tear of hydraulic amplifiers and influence quality of their operation. In that context a set of parameters that determine operation quality of hydraulic amplifiers was found out where mutual independence of the parameters, their unambiguousness and measurability served as the criteria for selection there of two methods of analysis were used that took account for the foregoing assumption, i.e. the method of maximum informative capacity of the parameter and the method that assumes maximum alteration of the technical condition due to execution of the test. The completed examinations made it possible to find out characteristic curves for hydraulic amplifiers with a linear distributing slider as well as with a rotary slider with regard to their accumulated operation time. Further predictions of the hydraulic amplifier lifetime take advantage of the assumption that the deterioration effect of functional parameters attributable to hydraulic amplifiers is represented by a series of time-related values (y1,y2.....yn)i.e. a set of discrete observations {y1=ksi(teta)} associated with an unsteady stochastic process ksi(teta). The relationships how functional parameters o f a hydraulic amplifier vary in pace with its operation time t are described by means of the Gaussian distribution with the assumption that the course of a functional parameter deterioration corresponds to its aggregated characteristic curve that represents resistance of a distributing device embedded into a hydraulic amplifier to wear and tear processes. Wear of crucial parts within a hydraulic amplifier is measured in terms how functional parameters of that part associated with its accuracy, sensitivity and switching speed are getting worse and worse as time goes by.
Źródło:: Journal of KONES; 2010, 17, 3; 165-172
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

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

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Skocz do pozycji: 14.

Tytuł:: Wzmacniacz pomiarowy o podwyższonych parametrach metrologicznych do zastosowań w paśmie akustycznym
Instrumentation amplifier for use in the audio frequency range
Autorzy:: Furmankiewicz, L.
Powiązania:: https://bibliotekanauki.pl/articles/157718.pdf
Data publikacji:: 2014
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: wzmacniacz pomiarowy
bufor
instrumentation amplifier (IA)
buffers
Opis:: W artykule przedstawiono strukturę rozbudowanego, dwukanałowego wzmacniacza pomiarowego (bufora) o podwyższonych parametrach metrologicznych w paśmie częstotliwości akustycznych. Wzmacniacz jest elementem systemu pomiarowego, w którym pełni rolę stopnia dopasowującego napięcia pływające do niesymetrycznego wejścia układu pomiarowego. Przedstawiono wyniki badań eksperymentalnych wybranych stopni wzmacniacza.
The paper presents an extended structure of two-channel instrumentation amplifier (IA). The IA has higher metrological parameters relating to typical-setup of an instrumentation amplifier (Fig. 2) in the audio frequency range. The IA is intended for use in a measurement system to calibrate low-value alternating-current standard resistors at audio frequencies. In the developed system a resistor RX is directly compared with a standard resistor RN (Fig. 1). The impedance ratio ZX/ZN of the resistors is determined from the measurement of the voltage ratio UX/UN. The measurement of floating voltages by a digitizer with grounded inputs requires IA (buffers) (B1, B2). Due to the assumptions concerning the system being developed, buffers should be characterized by a relatively high input impedance and small errors of the transformer voltage ratio over a frequency bandwidth from 40 Hz to 10 kHz. Block diagram of the IA is shown in Fig 3. The IA consist: two input buffers (BW1, BW2), input stage (SW) with floating ground (PM), difference amplifier (SR) and circuit for common mode voltage adjustment (KWNW). Figs. 4, 5, 6, 7 show a simplified schematic diagrams of the individual IA stages. In Figs. 8 and 9 the frequency characteristics of the module and phase error of the input buffer (BW1) voltage ratio are shown. The frequency characteristics of the input buffer BW2 are almost the same. In Fig. 10 the frequency characteristics of CMRR prior to adjustment and following the adjustment the real part of the CMR are shown.
Źródło:: Pomiary Automatyka Kontrola; 2014, R. 60, nr 11, 11; 954-956
0032-4140
Pojawia się w:: Pomiary Automatyka Kontrola
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: CNTFET Based OTRA and its Application as Inverse Low Pass Filter
Autorzy:: Prasad, Dinesh
Tayal, Divyam
Yadav, Ayesha
Singla, Laxya
Haseeb, Zainab
Powiązania:: https://bibliotekanauki.pl/articles/227047.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: carbon nanotube (CNT)
Operational Transresistance Amplifier (OTRA)
Opis:: Operational Transresistance Amplifier (OTRA) has been a topic of great interest recently. OTRA has proved itself to be an appropriate device for the analog applications. As MOS scaling suffers from various problems, carbon nanotube field effect transistor (CNTFET) has came into light as one of the brightest alternative for FET (Field Effect Transistors) based devices. This work has introduced a new CNTFET based OTRA which is capable of realising inverse low pass filter using two OTRAs and few passive elements. CNTFET based OTRA has been designed and simulated at 10nm technology node. The working ability of the designed model has been conformed using HSPICE simulation. It is compared with conventional CMOS based OTRA. The comparative analysis has revealed improvement in various performance parameters. The paper also presents how change in number of carbon nanotube in CNTFETs in OTRA circuit affects the transresistance gain and input impedance. The optimized results are also discussed to improve transresistance gain and input impedance. The paper also dealt with the realisation of inverse low pass filter using proposed CNTFET based OTRA.
Źródło:: International Journal of Electronics and Telecommunications; 2019, 65, 4; 665-670
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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