ALC circuit and radio frequency signal source

Abstract

The invention provides an ALC circuit and a radio frequency signal source. The ALC circuit comprises an input port, a radio frequency link connected to the input port, a feedback loop connected to theradio frequency link and an output port, wherein the radio frequency link comprises a variable attenuator connected to the input port, a first radio frequency amplifier connected to the variable attenuator, a temperature compensation module connected to the first radio frequency amplifier, a second radio frequency amplifier connected to the temperature compensation module and a power divider connected to the second radio frequency amplifier; the feedback loop comprises a detector connected to the power divider, a digital acquisition module connected to the detector, a digital processing module connected to the digital acquisition module and a digital-to-analogue conversion module connected to the digital processing module. According to the ALC circuit and the radio frequency signal source, the influence of the temperature on the gain of the radio frequency link is reduced, so that the calibration time can be saved, and the production efficiency can be improved.

Description

technical field [0001] The present invention relates to the field of microwave radio frequency technology, in particular to a general instrument in the field of microwave radio frequency, specifically an ALC circuit and a radio frequency signal source. Background technique [0002] The RF signal source is a general instrument in the field of microwave RF, which can provide a specific RF signal with stable output. Widely used in scientific research, education, industry and other fields. The two main specifications of an RF signal source are frequency range and amplitude dynamics. The main indicators in terms of amplitude include amplitude accuracy, minimum amplitude step and dynamic range. The automatic level control ALC circuit is the main circuit to realize the amplitude control part. [0003] If the RF signal source is to output an RF signal with an accurate amplitude, an amplitude stabilizing device is required. The traditional method is to use the analog ALC loop, an...

AI Technical Summary

Problems solved by technology

However, during the implementation of this scheme, it is necessary to calibrate the influence of temperature changes on the ALC loop, which takes a long time and is inefficient

In addition, there is an ALC OFF state in the ALC module circuit, and this solution cannot solve the influence of temperature changes on the amplitude in the ALC OFF state

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