Results 271 to 280 of about 5,099,079 (342)
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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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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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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 +3 more
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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 +3 more
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A Theorem Concerning Noise Figures
IRE Transactions on Circuit Theory, 1956A theorem is formulated and proved which determines the greatest lower bound of the single-frequency noise figure of a general system consisting of n amplifying devices and passive coupling elements. According to the theorem, this lower bound is equal to the noise figure of an optimum system using a selected one of these amplifying devices.
A. Bose, S. Pezaris
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Ultrasonic amplifier noise figure
Proceedings of the IEEE, 1968Experimental ultrasonic noise figures of the CdS ultrasonic amplifier are presented along with values of drift potential at which noise saturation is observed to occur.
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Noise figure measurement of narrow-band low noise system
2017 16th International Conference on Optical Communications and Networks (ICOCN), 2017The standard core protocol of Narrow Band Internet of Things (NB-IOT) was approved by the RAN plenary session in June 16, 2016. Global operators have a standardized IOT proprietary protocol. The successful completion of the standardization work also marks that the NB-IOT has entered the commercial stage.
Xiaoqing Shen +4 more
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Amplifier noise figure optimization
Proceedings of the IEEE, 1968In the presence of lossy input filters, device noise figure data do not permit complete minimization of the amplifier noise figure F A . However, with L-filters such optimum can be obtained by a simple graphical construction on device noise figure records.
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Analysis of noise parameters extraction from noise figure measurements
Proceedings of the 39th Midwest Symposium on Circuits and Systems, 2002Noise characterization of active devices continues to be an area of increasing significance in the rapidly expanding field of RF wireless communications. The accuracy of noise parameter estimation is a challenging task, limited by the uncertainties in the noise (noise source and noise figure) measurements, the errors in the source admittance ...
J. Sanderson, B.P. Kumar, G.R. Branner
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IEEE Microwave Magazine, 2009
This article summarizes a new approach presented in [1] to measure the noise figure of a differential low-noise amplifier (LNA) based on familiar cold-hot single-ended noise figure measurements employed by the majority of noise figure analyzers/meters.
Leonid Belostotski, James Haslett
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This article summarizes a new approach presented in [1] to measure the noise figure of a differential low-noise amplifier (LNA) based on familiar cold-hot single-ended noise figure measurements employed by the majority of noise figure analyzers/meters.
Leonid Belostotski, James Haslett
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Raman-noise-induced noise-figure limit for χ^(3) parametric amplifiers
Optics Letters, 2004The nonzero response time of the Kerr [chi(3)] nonlinearity determines the quantum-limited noise figure of chi(3) parametric amplifiers. This nonzero response time of the nonlinearity requires coupling of the parametric amplification process to a molecular-vibration phonon bath, causing the addition of excess noise through Raman gain or loss at ...
Paul L, Voss, Prem, Kumar
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Noise figure display with succeeding-stage noise compensation
Proceedings of the IEEE, 1971Automatic 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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