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Noise coefficient test method based on vector network analyzer and noise source

A technology of vector network analysis and noise figure, applied in the direction of noise figure or signal-to-noise ratio measurement, can solve the problems of inaccurate gain measurement and not considering the influence of port matching, and achieve the effect of improving dynamic range and accuracy

Active Publication Date: 2018-11-16
CHINA ELECTRONIS TECH INSTR CO LTD
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Problems solved by technology

The existing gain method uses a spectrum analyzer for measurement. The gain measurement is not accurate, and the influence caused by port matching is not considered. The test range generally requires a noise figure greater than 10dB and a gain greater than 20dB.

Method used

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  • Noise coefficient test method based on vector network analyzer and noise source
  • Noise coefficient test method based on vector network analyzer and noise source
  • Noise coefficient test method based on vector network analyzer and noise source

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Embodiment Construction

[0080] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0081] The invention proposes a noise figure measurement method based on a vector network analyzer and a noise source, which can remove the influence of port matching on the noise figure measurement, and trace the measurement accuracy to the noise source. The dynamic range of noise figure measured by this method can be from 0dB to 50dB, far exceeding the measurement range of noise meter and spectrum analyzer.

[0082] This method needs to be equipped with a noise source, which is used as a standard excitation source for noise power measurement. The noise source has a calibrated Excess Noise Ratio, which is defined as:

[0083]

[0084] In the formula: ENR—the excess noise ratio of the noise source;

[0085] T h — the equivalent output noise temperature when the noise source is turned on;

[0086] T c —The equivalent output noise temperatu...

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Abstract

The invention discloses a noise coefficient test method based on a vector network analyzer and a noise source, and belongs to the technical field of test. The method can be used to overcome the problem of a matching error between a tested piece and an instrument, is especially suitable for the condition that the tested piece is not matched well, and can be used to improve the test accuracy. The method is used in combination with a noise receiver of the vector network analyzer, the dynamic test range is widened, and both low and high noise coefficients can be measured accurately via the method;the vector network analyzer is used to measure the gain of the test piece; the vector network analyzer calibrates an error item via a port to obtain the most accurate gain of the test piece; the noise source is used to represent the receiver; and the noise source represents a gain bandwidth product of the receiver, the gain bandwidth product is measured accurately via formulas in cold and hot states, and the noise source can be traced back.

Description

technical field [0001] The invention belongs to the technical field of testing, and in particular relates to a noise figure testing method based on a vector network analyzer and a noise source. Background technique [0002] In any electronic device, there is noise, which will cause significant interference to the signals that users want to generate, transmit and receive. To characterize the noise characteristics of electronic devices, engineers introduce the concept of noise figure. With the rapid development of microwave communication, radar, navigation and other technologies, the requirements for low-noise devices are becoming more and more urgent. In order to test the performance of devices and measure the ability of devices to receive weak signals, it is necessary to measure the noise characteristics of devices and devices, which makes The test and measurement of noise figure becomes extremely important. [0003] At present, the instruments for measuring noise figure i...

Claims

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Application Information

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IPC IPC(8): G01R29/26
Inventor 段飞赵立军宋青娥梁胜利魏连成杨保国许春卿薛龙曹志英
Owner CHINA ELECTRONIS TECH INSTR CO LTD
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