Results 21 to 30 of about 362,427 (261)
Continuous-time adaptive control applied to rf amplifier linearization [PDF]
, 1994 A new approach to the RF power amplifier linearization problem is presented. The proposed solution applies non-linear theories (Lyapunov direct method) to adaptive filtering in order to improve the linearity of the RF amplifiers.
Bertran Albertí, Eduardo +2 more
core +1 more source
Sensors, 2023 Zero-ohm resistors, also known as jumpers, are commonly used in early radio frequency (RF) prototypes as they can help engineers identify the most optimal engineering solution for their system or create application-specific hardware configurations in ...
Aleksandr Vasjanov, Vaidotas Barzdenas
doaj +1 more source
Online Calibration for LTE-Based Antenna Array System
International Journal of Antennas and Propagation, 2016 This paper presents a novel calibration method that equalizes the impulse responses of all the Radio Frequency (RF) modules of an antenna array system operating in Long-Term Evolution (LTE) evolved NodeB (eNB).
Kyunghoon Kim +5 more
doaj +1 more source
Optical Self-Interference Cancellation With Frequency Down-Conversion Based on Cascade Modulator
IEEE Photonics Journal, 2020 A novel approach to simultaneous radiofrequency self-interference cancellation (SIC) and frequency down-conversion in a unified system is proposed and demonstrated experimentally based on cascade Mach–Zehnder modulators (MZM). The local oscillator
Jiaojiao Wang +4 more
doaj +1 more source
Active noise compensation for multichannel magnetocardiography in an unshielded environment [PDF]
, 1995 A multichannel high-T/sub c/-SQUID-based heart scanner for unshielded environments is under development, Outside a magnetically shielded room, sensitive SQUID measurements are possible using gradiometers.
Aarnink, W.A.M. +6 more
core +3 more sources
Improved Phase Stabilization of a Radio-Over-Fiber Link Under Large and Fine Delay Tuning
IEEE Photonics Journal, 2015 In this paper, we propose and demonstrate a phase-stabilized radio-frequency (RF) reference transmission scheme by actively stabilizing the optical path delay of the fiber link.
Feifei Yin +6 more
doaj +1 more source
IEEE Photonics Journal, 2019 We demonstrate a simultaneous frequency and time reference dissemination system over 80 km fiber with a phase-locked loop. The phase fluctuation of the transferred radio-frequency (RF) signal is compensated by adjusting the frequency of the ...
Xiaocheng Wang +7 more
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Research on the extension method of the main signal source of the synchrotron radiation device
Dianzi Jishu YingyongThe main signal source is one of the key components of the synchrotron radiation device. It is not only used to generate the highly stable reference signals required by each subsystem of the synchrotron radiation light source, but also used to generate ...
Zhang Kai +8 more
doaj +1 more source
Frontiers in Physiology, 2019 Background: It is known that the respiration-modulated photoplethysmographic (PPG) signals could be used to derive respiratory frequency (RF) and that PPG signals could be measured from different body sites.
Vera Hartmann +5 more
doaj +1 more source
Phase noise and jitter modeling for fractional-N PLLs [PDF]
Advances in Radio Science, 2007 We present an analytical phase noise model for fractional-N phase-locked loops (PLL) with emphasis on integrated RF synthesizers in the GHz range. The noise of the crystal reference, the voltage-controlled oscillator (VCO), the loop filter, the charge ...
S. A. Osmany +3 more
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