Broadband adjustable standard component for passive intermodulation measurement and adjustment method

Abstract

The invention discloses a broadband adjustable standard component for passive intermodulation measurement and an adjusting method. The broadband adjustable standard component comprises a coupler, an adjustable intermodulation generation source and a control circuit which are connected in sequence. The method comprises the following steps: the coupler samples CW carrier power and transmits the CW carrier power to the adjustable intermodulation generation source; the coupling degree of the coupler is adjusted, and the carrier power entering the adjustable intermodulation generation source is changed; the bias voltage applied to the diode is changed through the control circuit; and the adjustable intermodulation generation source realizes the change of a third-order intermodulation value IM3 according to the change of the bias voltage. According to the technical scheme, the Schottky diode serves as an adjustable intermodulation generation source, the intermodulation performance of the diode is adjusted through the bias voltage, so that intermodulation is distributed along a symmetrical intermodulation path, and a pair of adjustable CW signals are introduced into a passive intermodulation test loop at the same time to serve as an intermodulation measurement reference. The IM3 current and the bias voltage are in an exponential relationship, and the bias voltage is applied to the diode to enlarge the adjustable interval of the IM3.

Description

technical field [0001] The invention relates to the technical field of passive intermodulation testing, in particular to a broadband adjustable standard part and an adjusting method for passive intermodulation measurement. Background technique [0002] Passive intermodulation (PIM) is one of the most difficult problems in modern high-power multi-channel communication systems. High-precision PIM measurement plays an important role in PIM-related research. As the key to ensure the accuracy of PIM detection, standardized PIM reference sources are of great significance. Currently available commercial PIM reference sources are usually a port device that can only generate a constant reflective PIM reference. Therefore, two deficiencies hinder the widespread promotion of such references in high-precision PIM measurements. On the one hand, the frequency points of the fixed PIM reference value are relatively fixed and the range is narrow; on the other hand, the fixed PIM reference...

AI Technical Summary

Problems solved by technology

[0004] The present invention mainly solves the technical problem that the fixed PIM reference value of the original technical solution cannot guarantee the test reliability of the entire PIM test interval, and provides a broadband adjustable standard part and adjustment method for passive intermodulation measurement, which will The tertiary diode is used as an adjustable intermodulation source. By using the bias voltage to adjust the intermodulation performance of the diode, the intermodulation is distributed along a symmetrical intermodulation path, and a pair of adjustable CW signals are simultaneously introduced into the passive intermodulation test loop. , as the benchmark for intermodulation measurement, the IM3 current has an exponential relationship with the bias voltage, and the bias voltage is applied to the diode to expand the adjustable range of IM3. The host computer software records the bias voltage corresponding to the IM3 value under different frequencies and different powers Set the value, generate a record file, adjust and call the record file directly according to the required IM3 value, and realize the convenient and adjustable standard parts

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