基于TD-SCDMA的CMOS低通滤波器的设计

这里提出一种基于时分同步码多址技术（TD-SCDMA）的互补金属氧化物半导体（CMOS）滤波器带宽校正方法及校正电路。该方法应用于RS1012芯片（TDSCDMA无线收发芯片）,该芯片采用0.18um射频（RF）COMS工艺。滤波器带宽的调节范围和调节精度在理论和投片中都得到了验证。实现该方法的RC校正电路结构简单,版图面积很小,只有0.04 mm2,电流仅为600 uA。校正电路最大调节范围设计值为＋30%,校正精度为＋2.1%,此测试结果与理论计算是一致的。

Design on Low-pass Filter based on TD-SCDMA

A novel automatic tuning method for RC filters is proposed for CMOS zero-IF transceivers.The tuning range and tuning accuracy is analyzed theoretically.The method is applied to RS1012（TDSCDMA wireless transceiver chip）,the chip adopts 0.18um RF COMS process.The tunning circuit occupies 0.04,and its current comsumption is only 600uA.The measurement result of the filter and the tuning circuit shows that the maximum 30% time–constant variation could be tuned within 2.1% accuracy,this is consistent with the theoretical results.