CMOS1.4THzΩ155Mb/s光接收机差分跨阻前置放大器

A CMOS 1.4THzΩ 155Mb/s Differential Transimpedance Preamplifier for Optical Receiver

采用本土 CSMC 0 .6μm标准 CMOS技术设计实现了一种用于光纤用户网的 CMOS跨阻前置放大器 .电路采用差分结构以提高共模抑制比 ,减小高频下电源波动和寄生反馈通路的干扰 ,抑制衬底耦合噪声和温漂 ,从而有效抑制前置放大器的噪声 .同时前置放大器为双端输出 ,易与后面差分结构的主放大器级联 ,无需单端 -双端转换电路和片外元件 ,电路结构更为简单 ,实现了单片集成 .电路采用单级放大结构 ,比通常的多级电路更为稳定 .测试结果表明 ,前置放大器在 5 V电源电压下增益 -带宽积可达 1.4 THzΩ,等效输入电流噪声为 1.81p A/ Hz,可稳定工作在 15 5 Mb/ s(STM- 1)

A CMOS preamplifier for optical access network systems is realized in native CSMC 0.6μm CMOS technology.A differential architecture is adopted to increase the common mode rejection ratio of the whole circuit,to lower the interference from supply noise and parasitic feedback paths,and to suppress substrate noise and thermal drift.Thus the noise of the preamplifier can be reduced.At the same time,its complementary outputs allow a differential interface to the following differential main amplifier.Without single-ended to differential circuit,the chip achieves monolithic integration under a simpler configuration.Using single stage architecture,the circuit is more stable than a conventional multistage one.Testing results show that the circuit gains a high bandwidth transimpedance gain product up to 1.4THzΩ and a low equivalent input current noise of 1.81pA/[KG-4]Hz under a supply voltage of 5V.The implemented preamplifier can operate well at standard bit rate of 155Mb/s(STM-1).