跨阻放大器自动静噪电路的设计与实现  

Design and Implementation of an auto-squelch circuit in transimpedance amplifier

作　　者：张书磊[1] 莫太山[1] 叶甜春[1] 

机构地区：[1]中国科学院微电子研究所,北京100029

出　　处：《电子技术应用》2013年第6期46-48,52,共4页Application of Electronic Technique

摘　　要：采用0.35μm CMOS工艺设计并实现了一种新的应用于光纤通信跨阻放大器的自动静噪电路。提出的系统结构包括信号强度检测模块、比较基准产生电路、迟滞比较器和静噪控制单元。当输入信号减小到低于静噪使能阈值时,静噪模块将产生静噪使能信号,关闭信号通路;而当输入信号增大到高于静噪解除阈值时,静噪模块将产生静噪解除信号,打开信号通路。仿真结果表明,对于误码率10-10、灵敏度-40 dBm(100 nA)的155 Mb/s跨阻放大器,静噪使能和静噪解除两个阈值分别为47 nA和85 nA,静噪迟滞宽度为2.57 dB,满足系统要求。A novel auto-squelch circuit in transimpedance amplifier for optical fiber communication was designed and realized in a standard 0.35 I^m CMOS technology. The system architecture described in this paper is composed of a received signal strength detector, a comparing reference generator, a hysteresis comparator and a squelch control cell. When input current signal is below the squelch assert level, the squelch circuit will disable the data path automatically. Otherwise, when input current signal is above the squelch de-assert level, the squelch circuit will open the data path. The squelch circuit was implemented in 155 Mb/s transimpedance amplifier with -40 dBm sensitivity （BER=10-10）. The squelch assert and deassert level are 47 nA and 85 nA respectively. And the squelch hysteresis width is 2.57 dB.

关 键 词：自动静噪 跨阻放大器 接收信号强度指示 迟滞比较器 

分 类 号：TN432[电子电信—微电子学与固体电子学]