Fault detection circuit and method for self-checking of frequency mixer

Abstract

The invention provides a fault detection circuit and method for self-checking of a frequency mixer. The fault detection circuit comprises a signal conversion and rectification module, a current detection module and a comparison operation module. The connecting relations are shown as follows: the input end of the signal conversion and rectification module is connected with the forward direction of a diode in the frequency mixer, and the output end of the signal conversion and rectification module is connected with the current detection module and the comparison operation module. The signal conversion and rectification module is used for converting input signals into DC signals. The current detection module is used for detecting the amplitude of the DC signals. The comparison operation module is used for judging the amplitude of the DC signals and judging whether the DC signals exist or not. According to the fault detection circuit, the diode in the frequency mixer is introduced into the circuit to achieve rectification on high-frequency signals in the frequency mixer; the current detection module and the comparison operation module in the fault detection circuit conduct amplitude detection and operation processing on the rectified signals, and then the current health condition and fault condition of the frequency mixer can be judged.

Description

technical field

[0001] The invention belongs to the technical field of control and measurement, and in particular relates to a fault detection circuit and a detection method for mixer self-inspection. Background technique

[0002] With the rapid development of modern radar, electronic countermeasures, measurement and control communication and other electronic systems, as the core component of the communication circuit, the role of the mixer is particularly important. At present, most mixers developed at home and abroad have no corresponding inspection Circuit, that is, there is no self-test function, which makes it difficult to locate and troubleshoot system failures caused by mixer damage, which greatly affects equipment maintenance time. In order to reduce equipment maintenance time, faster and more accurate system For fault location, it is necessary to design a fault detection circuit for mixer self-test. Contents of the invention

[0003] In view of this, the technica...

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