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...

AI Technical Summary

Problems solved by technology

[0023] The main disadvantage of the current technology is that the performance indicators of the whole machine cannot drift after the noise figure analyzer is calibrated, but the performance indicators of most microwave and millimeter wave devices will change with temperature. When the temperature inside the noise figure analyzer chassis changes , it will inevitably cause the noise figure and gain of the receiving circuit of the noise figure analyzer to change, and the difference between the actual performance index of the whole machine and the performance index during calibration will inevitably introduce measurement errors when performing secondary error correction during the measurement process, and the above error, the measurement must be terminated, the DUT removed, and the noise source reconnected to the input port of the noise figure analyzer for calibration

This recalibration process not only affects the efficiency of the measurement, but also leads to inaccurate measurement results because the measurement personnel cannot determine when to recalibrate

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