最后，基于FPGA对数字下变频进行了设计及实现，具体包括：算法仿真、VHDL描述、FPGA仿真和实际系统测试。

At last, this thesis realizes digital down converter based on FPGA, and the whole designing process includes algorithm simulation, VHDL description, FPGA simulation and real system test.

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最后给出了FPGA实现的数字下变频器在测试中产生的波形和频谱，作了测试结果分析。

At the end of this paper, waves and spectra generated by FPGA DDC during tests are given and test results are analyzed.

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对空载、带载情况下变频器产生的不平衡电压和高次谐波的含量进行了测试与分析。

Reference to research status of MDT and by analyzing the special working environment of the ESP, the multi-signal are carried with motor power line.

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