Online correction device and method of temperature drift of noise coefficient analyzer

Abstract

The invention discloses an online correction device and method of temperature drift of a noise coefficient analyzer and belongs to the technical field of electronic testing. An online calibration circuit comprises a calibration switch and a noise source. An online calibration function can be started automatically according to change of temperature inside a noise coefficient analyzer cabinet, so that the defect that whether recalibration is needed or not needs to be decided artificially according to measuring result and environment temperature change is avoided, and technical requirements on measuring personnel are lowered; a measured member does not need to be removed during online calibration for reconnecting the noise source to an input port of a noise coefficient analyzer for calibration, so that calibration convenience and measuring efficiency are improved, risk of introducing measuring errors caused by the fact that timely calibration is not performed due to performance index change of the noise coefficient analyzer is lowered, and measuring accuracy is improved.

Description

technical field

[0001] The invention belongs to the technical field of electronic testing, and in particular relates to an online correction device and method for temperature drift of a noise figure analyzer. 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 and reduce the noise figure. With the rapid development of equipment technology, the requirements for low-noise devices are becoming more and more urgent, and the measurement accu...

Examples

Embodiment 1

[0075] An online correction device for temperature drift of a noise figure analyzer, the circuit of which is as follows figure 2 As shown, including the online calibration circuit, the online calibration circuit includes the calibration switch and the noise source;

[0076] Among them, the calibration switch is in the form of a single-pole double-throw switch, including three ports: common port, measurement port and calibration port; the output of the common port is connected to the band switch at the rear end, and the common port is respectively connected to the noise source of the calibration port, or to the measurement port Connect to receive the measurement signal input; when performing normal measurement and calibration at the input port of noise figure analysis, the switch is switched to the measurement port, at this time the common port is connected to the measurement port; when online calibration is required, the switch is switched to the calibration port, this When t...

Embodiment 2

[0081] On the basis of the above embodiments, the present invention also mentions an online correction method for temperature drift of a noise figure analyzer, which specifically includes the following steps:

[0082] Step 1: Calibration of the noise figure analyzer;

[0083] Step 1.1: When calibrating, connect a noise source with known output noise power characteristics in the hot state and cold state to the input port of the noise figure analyzer, switch the calibration switch to the measurement port, and set the noise source to analyze the noise figure in the hot state and cold state. The noise power measured by the instrument is N 2_ON and N 2_OFF , the excess noise ratio of the noise source used for calibration is ENR CAL , the cold state temperature is T cCAL , then there are:

[0084]

[0085]

[0086] Among them, T 0 Called the standard noise temperature, equal to 290k; Y 2 is the Y factor of the noise figure analyzer with the input port as the reference pl...

technical field

[0001] The invention belongs to the technical field of electronic testing, and in particular relates to an online correction device and method for temperature drift of a noise figure analyzer. 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 and reduce the noise figure. With the rapid development of equipment technology, the requirements for low-noise devices are becoming more and more urgent, and the measurement accu...

Examples

Embodiment 1

[0075] An online correction device for temperature drift of a noise figure analyzer, the circuit of which is as follows figure 2 As shown, including the online calibration circuit, the online calibration circuit includes the calibration switch and the noise source;

[0076] Among them, the calibration switch is in the form of a single-pole double-throw switch, including three ports: common port, measurement port and calibration port; the output of the common port is connected to the band switch at the rear end, and the common port is respectively connected to the noise source of the calibration port, or to the measurement port Connect to receive the measurement signal input; when performing normal measurement and calibration at the input port of noise figure analysis, the switch is switched to the measurement port, at this time the common port is connected to the measurement port; when online calibration is required, the switch is switched to the calibration port, this When t...

Embodiment 2

[0081] On the basis of the above embodiments, the present invention also mentions an online correction method for temperature drift of a noise figure analyzer, which specifically includes the following steps:

[0082] Step 1: Calibration of the noise figure analyzer;

[0083] Step 1.1: When calibrating, connect a noise source with known output noise power characteristics in the hot state and cold state to the input port of the noise figure analyzer, switch the calibration switch to the measurement port, and set the noise source to analyze the noise figure in the hot state and cold state. The noise power measured by the instrument is N 2_ON and N 2_OFF , the excess noise ratio of the noise source used for calibration is ENR CAL , the cold state temperature is T cCAL , then there are:

[0084]

[0085]

[0086] Among them, T 0 Called the standard noise temperature, equal to 290k; Y 2 is the Y factor of the noise figure analyzer with the input port as the reference pl...

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