Results 141 to 150 of about 2,394,133 (199)

Noise figure measurements on nonlinear devices

Proceedings of the 17th IEEE Instrumentation and Measurement Technology Conference [Cat. No. 00CH37066], 2001
A study of the effect of a cubic nonlinearity on the Y-factor method for measuring noise figure is performed. By hypothesis, the Y-factor technique does not take nonlinearities into account. It is shown that the presence of the nonlinearity largely influences the measured noise figure value. An alternative, single-tone noise figure measurement setup is
Geens, Alain, Rolain, Yves
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Noise and distortion figure - an extension of noise figure definition for nonlinear devices

IEEE MTT-S International Microwave Symposium Digest, 2003, 2003
Deals in the integration of additive and nonlinear distortion noise contributions into a single new figure of merit: Noise and Distortion Figure, NDF. In the same way as traditional noise figure, NF, was conceived to be a measure of SNR degradation, NDF is now proposed as its extension to nonlinear systems, as a measure of SINAD degradation.
Lavrador, P.M., Carvalho, N.B. de, Pedro, J.C.   +2 more
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Impact of Noise Bandwidth on Noise Figure

IEEE Transactions on Instrumentation and Measurement, 2019
Noise figures (NFs) are defined at each frequency of interest over a 1-Hz bandwidth. Their measurements are often performed over bandwidths of a few kilohertzs to a few megahertzs to accelerate the process and to reduce measurement jitter. These wider bandwidths introduce NF errors that can be substantial [>1 dB measured for a 0.4-dB NF low-noise ...
Alexander Sheldon, Leonid Belostotski, Geoffrey Messier, Arjuna Madanayake   +3 more
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Noise figure of m.e.s.f.e.t.s

IEE Proceedings I Solid State and Electron Devices, 1980
The noise figure of a m.e.s.f.e.t. is calculated as a function of drain current using the gradual channel approximation and the Shockley impedance-field technique. The results are conveniently presented as a single universal family of curves with no adjustable empirical factors.
C.R. Brewitt-Taylor, P.N. Robson, J.E. Sitch   +2 more
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EDFA Noise Figure Standard

Optical Amplifiers and Their Applications, 1997
As Erbium Doped Fiber Amplifiers (EDFA) see increasing use in fiberoptic systems, there is a developing requirement to accurately compare and calibrate measurement systems used to characterize these ...
Roger L. Jungerman, James R. Stimple
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Optical noise figure: theory and measurements

OFC 2001. Optical Fiber Communication Conference and Exhibit. Technical Digest Postconference Edition (IEEE Cat. 01CH37171), 2001
We examine the concept of optical noise figure in to two-port devices. Definitions of noise figure are discussed along with applications of noise figure to circuits incorporating cascades of amplifiers and other optical and optoelectronic devices.
Rodney S. Tucker, Douglas M. Baney
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NOISE FIGURES, NOISE TEMPERATURES, AND SYSTEM SENSITIVITY

1961
Abstract : The definitions of terms used in systems noise work are presented, as well as general techniques of describing noise power resulting from both the source and the excess noise added by the network under consideration. A unique feature presented is a unified development of 7 noise temperatures encountered in this field, with tables showing the
null PHILIP H., Jr ENSLOW
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Intrinsic noise figure derivation for fiber raman amplifiers from equivalent noise figure measurement

Proceedings of the Lightwave Technologies in Instrumentation and Measurement Conference, 2004., 2005
A complete analysis and measurement of the noise figure of Raman amplifiers is reported. The standard noise figure definition derived from the amplified spontaneous emission approach is discussed. A new approach, based on the field fluctuations, is proposed.
B. Bristiel, P. Gallion, Y. Jaouen, E. Pincemin   +3 more
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Comparison of noise figure calibration and measurement techniques using noise figure verification techniques

75th ARFTG Microwave Measurement Conference, 2010
We perform noise figure calibrations on a noise measurement receiver using the following techniques: A “Y-factor” technique that uses two source impedance states (a characterized “excess” noise source and a low reflection room temperature termination) in both the calibration and the measurement, a “Vector Cold Noise (VCN)” technique that uses multiple ...
Bob Shoulders, Ken Wong
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Noise figure in UWB systems

2007 7th International Conference on ASIC, 2007
Noise figure (NF) is a commonly used system parameter that quantifies the degradation in the signal-to-noise ratio (SNR) as the signal passes through a system. Different from the narrow band systems, the energy of the transmitted signal spread on wide band in the UWB (Ultra Wide Band) systems.
Wang Yao, Wei Li, Zhiyong Luo, Junyan Ren   +3 more
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