Results 21 to 30 of about 37,496 (307)
A unipolar thin‐film transistor‐based amplifier with enhanced DC offset suppression
Electronics Letters, 2021 This letter proposes a unipolar thin‐film transistor (TFT)‐based amplifier design that can provide enhanced DC offset suppression. The amplifier consists of an input AC coupling network and a capacitor bootstrap amplifier. By making the first pole of the
Yuming Xu +8 more
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Brain Stimulation, 2020 Background: Transcranial direct current stimulation (tDCS) has been shown to improve working memory (WM) performance in healthy individuals, however effects tend to be modest and variable.
O.W. Murphy +5 more
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Carrier frequency offset estimation for OFDM systems with time-varying DC Offset [PDF]
EURASIP Journal on Advances in Signal Processing, 2012 Orthogonal frequency division multiplexing (OFDM) systems with direct-conversion architecture suffer from both carrier frequency offset (CFO) and dc offset (DCO). In this paper, we study CFO estimation problem for OFDM systems with time-varying DCO (TV-DCO) caused by gain mode switch of low noise amplifier (LNA). Based on linear approximation of TV-DCO,
Tao Liu, Hanzhang Li
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Analysis and compensation of DC offset in OFDM systems over frequency-selective rayleigh fading channels [PDF]
, 2009 —Direct-conversion receivers have become popular in radio-frequency (RF) circuit design for their advantages of low cost, low power consumption, and fewer chip components over other architectures such as heterodyne receivers.
Chi-hsiao Yih, Yih, Chi-hsiao
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Robust Frequency Offset Estimation in the Presence of Time-Varying DC Offset
IEICE Transactions on Communications, 2009 In OFDM systems, the estimation/correction of carrier frequency offset (CFO) is crucial to maintain orthogonality among subcarriers. However, the CFO estimation suffers from DC offset (DCO) generated in low-cost direct-conversion receivers (DCRs). More seriously, in practice, DCO is time-varying due to the automatic gain control. In this paper, a novel
YUNUS, Umut +2 more
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An Efficient Method for Offset Mitigation in Free-Space Optical Systems
IEEE Photonics Journal, 2019 Channel estimation is a key feature for free space optical (FSO) wireless communication systems which are required for a high QoS and high data rate system.
Omar A. Saraereh +2 more
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Engineering Science and Technology, an International Journal, 2022 This paper presents the control strategy for parallel operation of an inverter to eliminate DC & AC circulating current. This paper also analyses the cross-current between parallel connected inverter due to the difference in output voltage magnitudes
Ravi Kumar Gupta +2 more
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Direct current offset controller for transformerless single-phase photovoltaic grid-connected inverters [PDF]
, 2010 Limitation of direct current (DC) injection into the alternating current (AC) network is an important operational requirement for grid-connected photovoltaic (PV) systems.
A. Ahfock +3 more
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DC offset performance of four LMS adaptive algorithms [PDF]
Proceedings of IEEE International Symposium on Circuits and Systems - ISCAS '94, 2002 The effects of DC offsets on four variations of the stochastic gradient algorithm are analyzed to determine the most appropriate algorithm for hardware implementation. The output mean squared error (MSE) performance in the presence of DC offsets is evaluated and compared with computer simulations for each of the algorithms assuming a Gaussian input ...
Ayal Shoval +2 more
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Energies, 2019 The scheme based on direct torque and flux control (DTFC) as well as active flux is a good choice for the interior permanent magnet synchronous motor (IPMSM) sensorless control.
Junlei Chen +4 more
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