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A measuring circuit and measuring method of noise signal power

A noise signal and measurement method technology, which is applied in receiver monitoring and other directions, can solve problems such as nonlinear measurement error, wide bandwidth, and poor frequency response, and achieve accurate measurement and improve measurement accuracy.

Active Publication Date: 2020-12-01
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the device under test has wide bandwidth and poor frequency response, and the noise power measured by intermediate frequency detection is small, the gain of the RF or microwave low noise amplifier circuit will be set to the maximum, because the RF and microwave low noise amplifier circuit and the first stage mixer The high-frequency circuit needs to process the full-band noise signal output by the DUT, which may work in a compressed state and introduce nonlinear measurement errors

Method used

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  • A measuring circuit and measuring method of noise signal power
  • A measuring circuit and measuring method of noise signal power

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Embodiment 1

[0039] A measuring circuit of noise signal power, its circuit is as figure 2 As shown, it includes a band switch, a radio frequency processing circuit, a microwave processing circuit, an intermediate frequency switch, a variable gain intermediate frequency amplifier, and an analog-to-digital converter; among them,

[0040] A radio frequency processing circuit, including a low-pass filter circuit, a variable gain radio frequency low noise amplifier circuit, a radio frequency superheterodyne mixing receiver circuit and a first intermediate frequency amplifier circuit;

[0041] Microwave processing circuit, including variable-gain microwave low-noise amplifier circuit, tunable band-pass filter circuit, microwave superheterodyne mixing receiver circuit and second intermediate frequency amplifier circuit;

[0042] It is characterized in that: the radio frequency processing circuit and the microwave processing circuit also include a radio frequency noise power detection circuit and...

Embodiment 2

[0049] On the basis of the foregoing embodiments, the present invention also mentions a method for measuring noise signal power, comprising the following steps:

[0050] Step 1: Obtain the compression threshold voltage, specifically including the following steps:

[0051] Step 1.1: Set the intermediate frequency gain of the variable gain intermediate frequency amplifier circuit to the minimum to ensure that the variable gain intermediate frequency amplifier circuit does not compress when the compression threshold voltage is obtained;

[0052] Step 1.2: Use an external continuous wave signal source capable of power scanning as the excitation source, input the signal to the noise signal measurement circuit, and obtain the compressed input power values ​​at different frequency points of the radio frequency processing circuit and the microwave processing circuit, where the radio frequency processing circuit The frequency interval of each compression input power value of the microw...

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Abstract

The invention discloses a measurement circuit and measurement method for noise signal power and belongs to the technical field of electronic test. The measurement circuit comprises a band switch, a radio frequency processing circuit, a microwave processing circuit, an intermediate frequency switch, a variable gain intermediate frequency amplifier and an analog-to-digital converter. According to the measurement circuit and the measurement method, on the basis of radio frequency and microwave noise power detection voltages and an intermediate frequency pre-detection power value, gain of a variable gain radio frequency low noise amplifier circuit, a variable gain microwave low noise amplifier circuit and a variable gain intermediate frequency amplifier circuit are reasonably set, a whole receiving circuit is guaranteed to be in an optimum linear receiving range, measurement precision of noise signal power is improved, manual intervention is avoided, and precise measurement of various different types of tested piece noise coefficients can be realized.

Description

technical field [0001] The invention belongs to the technical field of electronic testing, and in particular relates to a noise signal power measurement circuit and a measurement method. Background technique [0002] Any electrical system generates noise, which limits the ability of circuits and systems to receive and process weak signals. Noise figure is one of the most important parameters of the quantization circuit's ability to handle weak signals. The technological progress of electronic equipment and equipment such as microwave and millimeter wave communications, radar, navigation, and precision guidance is closely related to the increasingly improved receiver technology. Among them, the most important One aspect is to minimize the noise generated by the receiver itself. With the rapid development of equipment technology, the requirements for low-noise devices are becoming more and more urgent, and the measurement accuracy of noise figure indicators is also demanding ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/20H04B17/29
CPCH04B17/20H04B17/29
Inventor 魏连成梁胜利宋青娥郑利颖李文军薛龙
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP