用模拟数字混合乘法器实现矢量测量的原理及误差分析

模拟数字混合乘法矢量测量法原理中零阶保持器和D/A转换器的使用都必然会带来一定的原理性误差。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。结果证明，相位测量的理论误差为零，幅度测量的理论误差可用修正系数消除，且D/A有限字长引起的误差远小于一个LBS。

Vector measurement principle and errors analysis of analog-digital mixed multiplier

In vector measurment principle of analog-digital mixed multiplier,the zero-order holder and D/A all must cause the theoretical errors. 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. The results show that the phase error of the vector measurement is zero,and amplitude error can be eliminated,and the error caused by D/A is much lower than a LBS.