Multi-band intersected intermodulation test system

Abstract

The invention discloses a multi-band intersected intermodulation test system. Two broadband signal sources, two broadband power amplifiers, a broadband receiver and a power meter are used, a switch case switching emission channel and reception channel is added, and thus emission power can be switched to any test module. In the test module, the emission power of each input end is monitored by a coupler, and two test switches are used to switch the output electric bridge of a signal. Through the electric bridge, the signal is mixed and outputted to a diplexer. A first test switch and a second test switch respectively switch two receiving channels and two coupling channels. A third switch common end is connected to the broadband receiver, and other ports switch different module receiving ends. A fourth switch common end is connected to the power meter, other ports switch different module coupling ports, and emitting power is detected. Through independently switching an emission signal 1 channel, an emission signal 2 channel and an intermodulation reception channel, a single frequency band intermodulation test can be realized, and two-frequency-band intermodulation test can be realized too.

Description

technical field [0001] The invention relates to the technical field of passive device testing, in particular to a multi-band intermodulation test and cross intermodulation test system for passive devices. Background technique [0002] Passive intermodulation analyzer is a test equipment for passive intermodulation of passive devices and systems. The main technical parameters include test power, system residual intermodulation, and operating frequency bandwidth. [0003] Traditional intermodulation analyzers such as figure 1 As shown, the frequency of the first signal source and the second signal source is controlled by the main control computer, and after being amplified by the first power amplifier and the second power amplifier, the first combined filter is output. The tested first combined filter The test terminal is output to the device under test, which can test the reverse and forward intermodulation values ​​of the device under test. Reception mostly uses receivers ...

AI Technical Summary

Problems solved by technology

The traditional intermodulator can only test the intermodulation of one frequency band. For the test of multiple frequency bands, it is necessary to use multiple intermodulators of different frequency bands. However, the intermodulators of different frequency bands cannot work together and cannot test two The intermodulation products of different frequency band combinations, especially the intermodulation products falling in the third frequency band

Images