基于SBST的LVDT解調(diào)電路在線測(cè)試研究
[Abstract]:The LVDT (Linear Variable Differential Transformer) demodulation circuit chip is one of the important function modules of the main controller of the aero-engine system. This makes the chip more and more vulnerable to various failures. In order to improve the overall reliability of the aero-engine control system, it is urgent to equip an effective on-line fault detection module and to consider the effective application of the test method in the design phase of the chip. Therefore, the online testing method of LVDT demodulation circuit based on software self-test SBST (Software-Based-Self-Test) is studied in this paper. Based on the analysis of the existing on-line testing methods for IC chips, a testing structure based on software self-testing is proposed in this paper. The added microprocessor is used to apply the test vector and control the test flow. The test scheduler is stored in the ROM, of the processor while the test excitation and ideal response data are stored in the RAM. Based on the instruction of microprocessor, the test control and test scheduling program can realize the on-line test of each function module of LVDT demodulation circuit. In order to realize the test data with small scale and high fault coverage, except for the memory module which adopts the improved March C algorithm, the test data of the other function modules are generated by the ATPG tool software TetraMAX.. The test structure based on SBST has good expansibility and flexibility, and it can adapt to the function design and performance parameter adjustment of LVDT chip under test. In addition, a microprocessor self-testing method based on SBST is proposed for the core unit processor module of on-line testing architecture. According to the function of each sub-module, the underlying fault model can be tested by the corresponding processor instruction program. Based on the on-line testing method, the prototype circuit of LVDT demodulator based on SBST is constructed, and the dynamic test flow of SBST is simulated by using filter, controller and other modules as the circuit to be tested. The function of on-line test circuit is verified by EDA software such as Design Complier and self-developed hardware simulation platform based on Spartan6 FPGA, and the performance analysis is given.
【學(xué)位授予單位】:南京航空航天大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:V233.7
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