具有片上数字控制频率调谐的9MHz有源RC滤波器  

9MHz Active-RC Filter with On-Chip Digital Controlled Frequency Tuning

作　　者：吴恩德[1] 姚金科[1] 王志华[1] 

机构地区：[1]清华大学电子工程系,北京100084

出　　处：《Journal of Semiconductors》2005年第6期1250-1254,共5页半导体学报（英文版）

摘　　要：讨论了适用于无线局域网零中频收信机的4阶切比雪夫有源RC滤波器,为消除工艺偏差和环境变化对截止频率的影响,提出片上数字控制频率调谐电路.采用TSMC0.25μm1P5MCMOS工艺进行制造,测得调谐锁定时,滤波器的截止频率为9MHz,通带增益为0dB,增益波动小于1dB,带外抑制在30MHz处小于-40dB,通带内噪声小于-142dBm/Hz,当两输入信号的功率为-10dBm时,三阶交调小于-70dBm.This paper discusses a 4th order Chebyshev active-RC filter for a zero-IF receiver of wireless-LAN and,to avoid variance of technology and enviorment effects on cut-off frequency,proposes an on-chip digital controlled frequency tuning circuit.The filter is fabricated by TSMC-0.25μm 1P5M CMOS technology.Measurement results show that when tuning locked,the cut-off frequency of the filter is 9MHz,the passband gain is 0dB with ripple less than 1dB,the rejection at 30MHz is less than -40dB,the noise in pass-band is less than -142dBm/Hz,and when the power of both input signals are -10dBm,3rd intermodulation is less than -70dBm.

关 键 词：有源RC滤波器 片上频率调谐 无线局域网 

分 类 号：TN713[电子电信—电路与系统]