一种基于三项误差模型的I/Q解调器校准方法

A New Calibration Approach of I/Q Demodulator Based on 3-item Error Model

I／Q解调器的误差决定了PAD的相位测量精度。本文在I／Q解调器以往的两项误差模型基础上引入三项误差模型，并给出了相应的误差校准方法。实验结果表明，这种校准方法是合理有效的。在BEFC Ⅱ工作频率2856MHz上，经校准的I／Q解调器的误差范围减小为-1．8°-0．5°，且360°范围内任意相位值的测量误差均得到了抑制。

The accuracy of PAD depends on the errors of I/Q demodulator. On the basis of conventional 2- item error model of I/Q demodulator, this paper constructs a 3-item error model and presents a corresponding calibration approach. The measuring results show that its error range has been reduced to -1. 8°-0.5°, and its residual error has also been reduced when measuring from an arbitrary phase value of 0°-360°.