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Noise coefficient measurement method based on two detection modes

A technology of noise figure and measurement method, applied in transmission systems, transmission monitoring, electrical components, etc., can solve the problems of large manual calculation amount, complicated measurement process, slow measurement speed, etc.

Active Publication Date: 2016-11-09
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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Problems solved by technology

[0026] 1) It can only measure point frequency, the measurement speed is slow, the measurement process is complicated, and the user has a large amount of manual calculation;

Method used

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  • Noise coefficient measurement method based on two detection modes
  • Noise coefficient measurement method based on two detection modes
  • Noise coefficient measurement method based on two detection modes

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Embodiment Construction

[0064] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0065] The measuring principle of the present invention is as follows:

[0066] The principle of this method is based on the relationship between the noise power generated by the linear network itself and the noise figure, and it is necessary to accurately measure the gain of the DUT and the noise power generated by the DUT itself.

[0067] N add =(F-1)GkT 0 B (8)

[0068] Where: N add — the noise power generated by the DUT itself;

[0069] F—noise figure of the tested part;

[0070] G—the gain of the tested part;

[0071] k—Boltzmann constant (1.38×10 -23 J / K);

[0072] T 0 —Standard noise temperature (290K)

[0073] B—Receiver bandwidth.

[0074] The invention is suitable for vector network analyzers, and can accurately measure the gain G of the tested part through the advanced error correction technology of the vector network analy...

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Abstract

The invention discloses a noise coefficient measurement method based on two detection modes, and belongs to the technical field of tests. The method comprises the steps of computing a noise power generated by a vector network analyzer according to powers acquired by two detection modes which respectively adopt an average value and an effective value, and working out a noise coefficient of the vector network analyzer according to a relation between the noise powers and the noise coefficients; then connecting a measured piece, measuring an overall noise power generated by the measured piece and the vector network analyzer and a gain of the measured piece, and working out a noise coefficient of the measured piece and the vector network analyzer cascaded together; and at last, working out a noise coefficient of the measured piece according to a noise coefficient cascading formula. According to the method, measurement of the noise coefficient can be achieved without precisely calibrating a noise source, high precision and rapid scanning measurement of the noise coefficient can be achieved without configuring a noise coefficient analyzer, and thus the test cost is reduced; furthermore, the noise bandwidth can be counteracted during a computation process, so that the adverse effects of the bandwidth accuracy on measurement precision are overcome.

Description

technical field [0001] The invention belongs to the technical field of testing, and in particular relates to a noise figure measurement method based on two wave detection methods. Background technique [0002] Noise figure is one of the key parameters that characterizes the ability of a receiver and its components to handle weak signals in the presence of thermal noise. The bit error rate (BER) and noise figure (NF) in the receiver system both characterize the ability of the receiver to process small signals, and the noise figure can not only characterize the performance of the entire receiver system, but also be used to characterize the The noise performance of various components (such as preamplifiers, mixers, intermediate frequency amplifiers, etc.), so the measurement of noise figure is very critical for product development and manufacturing. [0003] The most commonly used method for noise figure measurement is the Y factor method (also known as the cold / heat source me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/327H04B17/336
CPCH04B17/327H04B17/336
Inventor 宋青娥许建华梁胜利郑利颖李文军薛龙
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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