Amplifier online self-test control circuit device

Abstract

The invention relates to an amplifier online self-test control circuit device. The device comprises an input end, an output end, a test voltage generator, an amplifier, an A / D sampling control circuitand an A / D sampling circuit, wherein the input end is connected with input voltage signals Vin, the amplifier includes a first operational amplifier, the input end is connected with the amplifier andthe A / D sampling circuit, the A / D sampling circuit is connected in parallel with the amplifier, one end of the test voltage generator is connected with the amplifier, and the other end of the test voltage generator is connected with the A / D sampling control circuit, and the amplifier is connected with the output end. According to the amplifier online self-test control circuit device of the invention, the test voltage generator is set to be connected with the A / D sampling circuit, and therefore, the online self-testing of the working state of an amplifier circuit to be tested can be realized,the normal operation of the amplifier circuit to be tested is not affected, and a detection result is reported to a single-chip microcomputer; the A / D sampling circuit is used for acquiring voltage signals that a amplifier online self-test circuit needs to monitor, so that the single-chip microcomputer can judge the working state of the amplifier circuit. The device has the advantages of real-timedetection, high reliability and practicability.

Description

technical field [0001] The invention relates to the technical field of self-test control, in particular to an amplifier online self-test control circuit device. Background technique [0002] At present, there are more and more applications to monitor the working status of the amplifier circuit. BIT self-test technology is commonly used for monitoring tasks, that is, additional test circuits and single-chip microcomputers are added to monitor the working status of the amplifier under test at any time. [0003] The self-test control circuit of the amplifier circuit mainly has two types: off-line type and on-line type. When the off-line type test circuit tests the working state of the amplifier, a switch needs to be added to cut off the signal input of the amplifier and input the self-test voltage signal at the same time. If the amplifier The output signal is consistent with the design signal, that is, it is determined that the amplifier circuit is working normally, but adding ...

AI Technical Summary

Problems solved by technology

[0003] The self-test control circuit of the amplifier circuit mainly has two types: off-line type and on-line type. When the off-line type test circuit tests the working state of the amplifier, a switch needs to be added to cut off the signal input of the amplifier and input the self-test voltage signal at the same time. If the amplifier The output signal is consistent with the design signal, that is, it is determined that the amplifier circuit is working normally, but adding switches will inevitably increase the circuit links, thereby reducing the reliability of the amplifier circuit, which has limitations; when the online test circuit is testing the working state of the amplifier, then It is necessary to add an additional input self-test voltage signal to the signal input terminal of the amplifier. If the output signal of the amplifier is consistent with the design signal, it is confirmed that the amplifier circuit is working normally; this kind of test will directly change the working signal during the test, which may easily cause the working state of the amplifier to deviate. shift and affect the normal operation of the amplifier; both self-test control circuits have limitations

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