Analyzing and amplifying circuit and device suitable for tiny signals

Abstract

The invention discloses an analysis and amplification circuit and device suitable for tiny signals, and the circuit comprises a filter circuit which is configured to have the same effect as a filter capacitor in an electronic product; the filter circuit is used for filtering tiny signals output when the electronic product is subjected to failure analysis; the signal amplification circuit is used for performing gain adjustment on the filtered tiny signal and outputting a gain adjustment signal, so that distortion of the obtained tiny signal due to failure of a filter capacitor in an internal circuit of the electronic product can be avoided, and further failure analysis can be performed on other electronic devices of the internal circuit of the electronic product; on the basis, a fault component of an internal circuit of the electronic product can be determined more accurately, and the signal amplification circuit is arranged to amplify the filtered tiny signal, so that the oscilloscope can clearly display the amplified gain adjustment signal. And the accuracy of failure analysis of the internal circuit of the electronic product is effectively improved.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to an analysis and amplification circuit and device suitable for small signals. Background technique [0002] In the failure detection of electronic products, it is necessary to obtain the signals output by the internal circuits of the electronic products, so as to analyze the faults or failed components in the electronic products through the waveform of the output signals. [0003] The internal circuits of electronic products are often provided with capacitors for filtering to filter out clutter signals in their output signals, so that the failed components of electronic products can be analyzed according to the output signals after the interference has been eliminated. The waveform of the signal is distorted due to the influence of the interference signal. Based on this signal, only the failure of the electronic product due to the failure of its internal filter capacitor...

AI Technical Summary

Problems solved by technology

[0003] The internal circuit of an electronic product is often equipped with a capacitor for filtering to filter out the clutter signal in its output signal, so that the failed components of the electronic product can be analyzed according to the output signal after the interference is eliminated, but when the capacitor fails, the obtained The waveform distortion of the signal is caused by the influence of the interference signal. Based on this signal, only the fault caused by the failure of the internal filter capacitor of the electronic product can be judged, and the failure of other components in the circuit cannot be further analyzed.

[0004] In addition, because the fault signal output by electronic products is usually a tiny signal with a small amplitude, and some oscilloscopes with low precision have limited magnification, when they are displayed on the oscilloscope, the obtained fault signal cannot be displayed clearly. It also affects the failure analysis of the internal circuit of electronic products

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