一种基于CMOS工艺射频有源滤波器的设计

射频滤波器是无线通信系统的关键部件之一。本文根据射频SoC的需求，设计了一种基于Q-增强型射频有源CMOS LC型滤波器。该滤波器利用负阻抗增强电路品质因数，可有效地解决射频片上无源LC滤波器的品质因数偏低，插入损耗偏大的问题。该滤波器采用TSMC 0.18um CMOS工艺，当供电电压为1.8V，中心频率在2.142GHz时，-3dB带宽仅为36MHz。仿真结果表明，该滤波器正确有效，适于全集成。
关键词: 片上电感；CMOS工艺；有源滤波器；射频SoC
A Design Of RF Active Filter Using CMOS Technology
Gao zhi-qiang, Yu ming-yan, Ye yi-zheng
（Microelectronics Center of Harbin Institute of Technology, Harbin 150001, China）
Abstract: RF filter is one of the key components in wireless systems. In this paper, a RF active LC filter based on
Q enhancement has been implemented according to RF SoC （System on a Chip） requirements. The quality
factor of the filter is enhanced by negative resistance, and the filter can solve the problems which the quality
factor is lower and insertion loss is larger in the passive filters. The center frequency is about 2.142GHz in TSMC
0.18um CMOS process when the supply voltage is 1.8V and the -3dB bandwidth is only 36MHz. The simulated results indicate that the filter is both effective and suitable for integration.
Key words: On-chip inductor; CMOS process; Active filter; Radio-Frequency System on a Chip;