CMMB系统中RSSI电路设计  

Limiting amplifier and received signal strength indicator for CMMB receiver

作　　者：庄海孝[1,2] 马成炎[1,3] 叶甜春[1] 潘文光[1] 黄伟[1] 何晓丰[1] 

机构地区：[1]中科院微电子研究所,北京100029 [2]中国空间技术研究研发中心,北京100094 [3]杭州中科微电子有限公司,浙江杭州310053

出　　处：《浙江大学学报（工学版）》2011年第5期840-845,906,共7页Journal of Zhejiang University：Engineering Science

基　　金：国家科技重大专项资助项目(2009ZX1031-002-008)

摘　　要：为了设计一款应用于中国移动多媒体广播标准(CMMB)系统射频前端的限幅器电路及场强指示器电路,提出一种新的直流失调补偿方案,该方案采用分段反馈原理实现限幅器内抵消直流失调部分电路的片内集成并且对直流失调量能起到有效抑制.该电路采用台集电(TSMC)0.18μm互补金属氧化物半导体(CMOS)工艺实现,测试结果表明,该限幅器达到64 dB的电压增益,可以对载波为5 MHz、带宽为9.9 MHz的中频信号进行放大;场强指示器的动态范围大于70 dB,场强检测的误差小于3 dB,符合CMMB标准接收机系统对信号强度指示电路(RSSI)电路的设计要求.A highly integrated limiter and received signal strength indicator（RSSI） for CMMB receiver system was realized. In order to reduce the influence of DC offset on RSSI, a novel topology based on feedback in sections for the limiting amplifier was proposed, which is very suitable for fully integrating. The modular circuit was implemented in a TSMC standard 0. 18 μm CMOS process. Measured results show that the DC offset is compensated. The proposed CMOS limiter has 64 dB voltage gain and can amplify the 5 MHz intermediate frequency signal with 9.9 MHz bandwidth under all temperature and process corner condition. The indication range is greater than 70 dB within linearity error less than ±3 dB, suitable for the RSSI applied for CMMB receiver.

关 键 词：RSSI 限幅器 非平衡源耦合对 分段反馈 直流失调抑制 

分 类 号：TN929[电子电信—通信与信息系统]