The present invention provides a method and apparatus for calibration of DC bias, the analog baseband feedback zero IF receiver system output differential voltage output, whether the judgment of zero IF receiver system meets the convergence condition, the calibration of the baseband signal of the zero if receiver. In the calibration process, used from large to small, progressive way to set each calibration adjustment value, and the value of each calibration calibration overlay, so that the whole process of DC offset calibration has a first coarse and successive transition to fine tune the effect, can quickly and accurately realize the DC offset calibration, to achieve convergence conditions. Furthermore, the DC offset calibration of time division duplex zero if receiving system can be calibrated by using the non receive data slot of time division duplex zero IF receiver system, so as to improve the real-time performance of DC bias calibration.
【技术实现步骤摘要】
【技术保护点】
１．一种直流偏置校准方法，其特征在于，包括以下步骤：步骤Ｓ１０１：获取所述零中频接收系统输出的模拟基带差分电压；步骤Ｓ１０２：判断所述模拟基带差分电压是否符合预定收敛条件，是则停止校准调整；否则，对所述模拟基带差分电压进行模数转换，获取直流偏置校准的基准电压；步骤Ｓ１０３：将所述基准电压乘以２的－ｎ次方，获取本次直流偏置校准的调整值，其中，ｎ是初始值为１的正整数，并且ｎ的取值在每次执行直流偏置校准后加１，并根据所述模拟基带差分电压的正负决定所述调整值的正负；步骤Ｓ１０４：将前一次直流偏置校准的校准值和本次计算获得的调整值叠加，获得本次直流偏置校准的校准值，并根据本次的所述校准值对所述零中频接收系统输出的模拟基带差分电压进行直流偏置校准；步骤Ｓ１０５：判断调整后的所述模拟基带差分电压是否符合所述预定收敛条件，是则停止校准调整；否则，重复执行步骤Ｓ１０３、Ｓ１０４。
【技术特征摘要】
【专利技术属性】
技术研发人员：刘畅远，张凯，
申请(专利权)人：京信通信系统中国有限公司，
类型：发明
国别省市：81
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