根据定点仿真结果还发现：在高量化字长的情况下，选取合适的定标方式所得到的定点性能甚至不比浮点性能差。

And the result of simulation also shows that: performance of fixed-point system is no worse than float-point system when quantization of high order and suitable fix point are employed.

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针对零阶保持器引起的幅度误差和相位误差，以及D/A转换器有限字长引起的误差进行了较为详细的分析，并进行了D/A误差仿真试验。

This paper mainly describes the amplitude and phase errors caused by zero-order holder and the error caused by finite word length of D/A, and computer simulation test of D/A error is also introuced.

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