← 返回 JSSC 论文列表JSSC 2006第7期RF & Wireless0.13μmOp-Amp
A 4th-Order Active- /71/109-RC Reconfigurable (UMTS/WLAN) Filter
一种用于UMTS/WLAN接收器的四阶低通连续时间滤波器，采用双二阶单元级联结构，显著降低功耗。
0.13μm CMOS, 3.4mW (UMTS), 11.4mW (WLAN), 0.9mm²面积
四阶滤波器低通滤波器UMTS/WLANActive-RC片上调谐
▸创新点1：采用双二阶单元级联结构（方法创新）。通过级联两个Active-RC双二阶单元实现四阶低通滤波器，优化了滤波器的频率响应特性，同时保持了结构的简洁性和可调性，适用于UMTS/WLAN多模接收机。
▸创新点2：单个运放用于每个双二阶单元（电路创新）。每个双二阶单元仅使用一个运放，且运放的Unity-Gain-Bandwidth（UGB）与滤波器截止频率相当，显著降低了运放功耗（UMTS模式3.4 mW，WLAN模式4.2 mW），相比传统闭环滤波器配置功耗大幅减少。
▸创新点3：片上调谐电路调整截止频率偏差（系统创新）。集成片上自动调谐电路，动态补偿因工艺偏差、老化和温度变化引起的截止频率偏移，提升了滤波器的稳定性和可靠性，适应复杂工作环境。
▸创新点4：基于自动设计工具的全芯片设计（方法创新）。采用自动化设计工具实现滤波器设计，实验数据与预期性能高度吻合（0.13μm CMOS工艺，面积0.9 mm²），验证了工具的高效性和设计流程的可扩展性。
Abstract
A fourth-order low-pass continuous-time filter for a UMTS/WLAN receiver of a reconfigurable terminal is presented. The filter uses the cascade of two Active- -RC biquad cells. A single opamp is used for each biquad and its unity-gain-bandwidth is comparable to the filter cut-off frequency. Thus, the opamp power consumption is strongly reduced w.r.t. other closed-loop filter configurations. The cut-off frequency deviation due to the technological spread, aging and temperature variation is adjusted by an on-chip tuning circuit. The device in a 0.13 m CMOS technology occupies a 0.9 mm /50area and it consumes 3.4 mW and 11 4.2 mW for the UMTS and WLAN, respectively. The full chip has been designed using an automatic design tool, which is validated by the agreement between the experimental results and the expected performance.