Method for improving source dynamic range of vector network analyzer under wide temperature condition

Abstract

The invention discloses a method for improving the source dynamic range of a vector network analyzer under a wide temperature condition, and particularly relates to the technical field of measurementof gain compression of a microwave amplifier by the vector network analyzer. According to the method, adjustment is performed based on an automatic level control circuit; source output power is detected through a detector tube; and after an output voltage of the detector tube is compensated and amplified by a double-slope logarithmic amplification circuit having a temperature compensation circuitand a digital compensation circuit, the output voltage is added with a calibration voltage generated by a main power calibration circuit with a temperature compensation circuit part, and the summed voltage signal is subjected to integral amplification, so that the attenuation of an electrically controlled attenuator is adjusted to control the magnitude of the source output power. By adding the temperature compensation circuits to the main power calibration circuit and the double-slope logarithm amplification circuit of the automatic level control technology, the influence of temperature changeon the source output power is reduced, and the dynamic range of the source power is increased.

Description

technical field [0001] The invention relates to the technical field of microwave amplifier gain compression measured by a vector network analyzer, in particular to a method for improving the source dynamic range of a vector network analyzer under wide temperature conditions. Background technique [0002] The principle of the automatic level control technology of the synthetic source of the vector network analyzer is as follows. The output power of the source is detected by the detector tube. Because of the nonlinearity of the detector tube, the output voltage of the detector diode needs to be detected by a double-slope logarithmic amplifier circuit and a digital compensation circuit. compensation, and then integrate and amplify the compensated voltage signal to adjust the attenuation of the electronically adjustable attenuator to control the output power of the source. This automatic level control technology is as follows: figure 1 shown. [0003] The existing automatic lev...

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Problems solved by technology

[0004] The characteristics of electronic devices will change with the temperature, and these changes will cause the output power of the source to change. The automatic level control circuit can adjust the gain of the source module according to the output power set on the front panel of the instrument, but affected by the temperature, the range of the output power will vary such that the source power dynamic range is reduced

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