Limiting amplifier and received signal strength indicator for CMMB receiver
ZHUANG Hai-xiao1，3, MA Cheng-yan1,2, YE Tian-chun1, PAN Wen-guang1, HUANG Wei1,HE Xiao-feng1
1. Institute of Microelectronics, China Academy of Sciences, Beijing 100029, China; 2. Hangzhou Zhongke Microelectronics Co.,Ltd , Hangzhou 310053, China; 3.Research and Development Center, CAST,Beijing 10094,China
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.
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