关键词: 零中频, 相位误差, I/Q不平衡, 器件工艺

Abstract:

The zeroIF receiver system with the advantagments of  high integration and low power consumption and ease of monolithic integration, is becoming a highly competitive structure in the radio frequency receiver. For the existences of the IQ imbalance and the DC drift inherent problems in zeroIF receiver, the system performance of image signals generated from existence of the phase shift in two types of receivers has been analyzed, and its suppression has been made simulation and comparison. Based on the similink software, the impact of the existing phase error in the crossmixing structure on the performance of the receiving system is superior to the conventional singlequadrature zeroIF structure ,which is mainly analyzed. Under the condition of the same phase error vector change and signal to noise ratio for the sensitivity of phase of the two receivers have been compared. The performance via experiment shows that the crossmixing structure has greatly reduced the sensitivity of the integrated device technology deviation, which enables it to more quickly be invested in the actual market.

Key words: zeroIF;the phase error;I/Q imbalance;device technology