题目/Title：片上锁相环调谐的低功耗中频复数滤波器设计
                        Low-Power IF Complex Filter with on-Chip Tuning Circuit Based on PLL

作者/Author：贠磊,李国林
                        Lei Yuan,Guolin Li

期刊/Journal：半导体技术 Semiconductor Technology

年份/Issue Date：2008.Sept.

卷（期）及页码/Volume（No.）&pages：Vol.33, No.9, pp. 821 - 824

摘要/Abstract：
讨论了应用于IEEE802.15.4标准低中频接收机的3阶贝塞尔复数gm-C滤波器,其中跨导器采用Nauta结构.为了消除工艺偏差、温度变化、老化对截止频率的影响,滤波器电路使用了片上锁相环调谐电路.滤波器设计采用HJTC-0.18 μm 1P6M CMOS混合工艺,中心频率为+3 MHz,-3 dB带宽为2.6 MHz.仿真结果显示临道、间道抑制分别为26.4、44 dB,镜像抑制为31.4 dB,带内SFDR为54.8 dB.复数滤波器电源电压为2.5 V,整体消耗的电流约为1.61 mA.
A 3rd order Bessel complex gm-C filter which uses Nauta’s transconductor for a low-IF receiver of IEEE802.15.4 was discussed．To avoid variance of technology and enviorment effects on cut—off frequency this filter used an on—chip tuning circuit based on PLL．Based on HJTC-0.18 um 1P6M CMOS technology，the filter is centered at +3 MHz and have a passband of 2.6MHz．Simulation results showed that adjacent and alternate channels are attenuated by 26.4 dB and 44 dB．The image signal is rejected by 31.4 dB and the in—band SFDR is 54.8 dB．The complex filter and tuning circuit dissipates 1.61 mA current from a 2.5V supply．