应用于WIFI或BLE接收机可重构有源RC滤波器设计  

Reconfigurable active RC filter design for WIFI or BLE receivers

作　　者：宋东蔚 SONG Dongwei(College of Electronics and Information Engineering,Shanghai University of Electric Power,Shanghai 200120,China)

机构地区：[1]上海电力大学电子与信息工程学院,上海200120

出　　处：《电子设计工程》2024年第9期90-95,共6页Electronic Design Engineering

摘　　要：文中提出一种可重构的有源RC滤波器,其可以同时适用于WIFI6/BLE(低功耗蓝牙)传输协议。该滤波器基于40nm CMOS工艺设计,其可以在五阶切比雪夫低通滤波器与三阶巴特沃斯复数带通滤波器进行切换,并基于可编程的电阻和电容,实现增益和带宽的调节。为了满足高截止频率(80MHz)的场景,以及相应的带宽精度,滤波器使用一种基于新补偿技术的新型全差分运算放大器,并采用PTAT电流,该放大器优化了滤波器高频性能并最大限度地减少了电流消耗。版图后仿真结果表明,在WIFI应用中,滤波器的典型带宽为10、20、40、80 MHz,增益调节范围0~24 dB,单路电流消耗为2、3、4.5、5.1 mA,拥有出色的相邻信道抑制:-36 dB@160 MHz(80 MHz带宽);BLE模式下,中心频率可在1 MHz和2 MHz之间进行切换,并拥有大于30dB的镜像抑制,增益0~24 dB可调,单路功耗为1.2 mA。This paper proposes a reconfigurable active RC filter,which can be applied to WIFI6/BLE(low power Bluetooth)transmission protocol at the same time.The filter is designed based on 40 nm CMOS technology.It can switch between the 5th order Chebyshev low-pass filter and the 3rd order Butterworth complex band-pass filter,and realize the adjustment of gain and bandwidth based on prog-rammable resistance and capacitance.In order to meet the scenario of high cut-off frequency(80 MHz)and the corresponding bandwidth accuracy,the filter uses a new fully differential operational amplifier based on new compensation technology,and uses PTAT current,The amplifier optimizes the high frequency performance of the filter and minimizes the current consumption.The post-layout simulation results show that in the WIFI application,the typical bandwidth of the filter is 10,20,40,80 MHz,the gain adjustment range is 0~24 dB,and the single-channel current consumption is 2,3,4.5,5.1 mA which has excellent adjacent channel suppression:-36 dB@160 MHz(80 MHz bandwidth);In BLE mode,the center frequency can be switched between 1 MHz and 2 MHz,and the image suppression is greater than 30 dB,the gain is 0~24 dB adjustable,and the single-channel power consumption is 1.2 mA.

关 键 词：WIFI BLE 切比雪夫 复数带通 有源RC滤波器 

分 类 号：TN386.1[电子电信—物理电子学]