Results 211 to 220 of about 654,186 (267)

Impact of Noise Figure on a Satellite Link Performance

IEEE Communications Letters, 2011
Small satellite link performance analysis is critical for assessing the adequacy of a transmitter to successfully transfer data at the desired rate. This is especially obvious when considering highly adaptive small satellite systems that exhibit static and active/dynamic power requirements.
Sunday C. Ekpo, Danielle George
openaire   +2 more sources

Noise figure test-set for simultaneous measurements of gain and noise figure of microwave devices

Proceedings of 8th Mediterranean Electrotechnical Conference on Industrial Applications in Power Systems, Computer Science and Telecommunications (MELECON 96), 2002
A simple method to characterize in term of noise figure and available gain both matched and mismatched devices is down. Comparison with conventional method is reported to show the validity of the method proposed that provides an effective way of employing commercial noise figure meters.
A. Di Paola, M. Sannino
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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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Matrix Representations of Noise Figures and Noise Figure Charts in Terms of Power Wave Variables

IEEE Transactions on Microwave Theory and Techniques, 1968
The noise power, excess exchangeable noise figure, and excess transducer noise figure of a linear active two-port are represented by the power wave scattering transfer matrix. It follows that these noise figures are expressed as ratios of two Hermitian forms, and that their stationary values and the reflection coefficients at the input which yields ...
K. Hirano, S. Kanema
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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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Noise figure display with succeeding-stage noise compensation

Proceedings of the IEEE, 1971
Automatic display of noise figure by the usual method of noise reference modulation is limited to test objects with large power gain. It is shown that the noise contribution of succeeding stages is rendered ineffective when modulating the object under test.
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Figures of uncertainty for noise measurements

81st ARFTG Microwave Measurement Conference, 2013
In this paper we introduce two figures of uncertainty (FOU) for the assessment of noise figure measurements. These figures of uncertainty are readily determined if the scattering parameters of the device under test (DUT) are available. The two FOUs provide two types of information.
M. Seelmann-Eggebert, B. Baldischweiler, B. Aja, D. Bruch, H. Massler   +4 more
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The noise figure of junction transistors

Proceedings of the IEE - Part B: Electronic and Communication Engineering, 1959
An expression for the noise figure N of a junction transistor is derived from a noise equivalent circuit based on the theory of shot noise in p-n junctions, and on a transistor small-signal equivalent circuit. The thermal or Johnson noise generated in the a.c. extrinsic base resistance, rbb?, is included, while `excess?
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The noise figure of optical amplifiers

IEEE Photonics Technology Letters, 1998
The noise figure definition used for the characterization of optical amplifiers is critiqued. It is shown that it is inconsistent with the IEEE standard established for electronic amplifiers. A noise figure definition is proposed that is consistent with the IEEE standard and that is shown to be superior to the one currently in use.
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The noise figure of transistor converters

IRE Transactions on Broadcast and Television Receivers, 1961
The noise figure of a transistor converter may be expressed in terms of the usual transistor and circuit parameters (source resistance, base resistance, emitter-base diode impedance, current gain, cutoff frequency, and conversion conductance). Theoretical values are in good agreement with measured values.
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