一种BiCMOS光电耦合隔离放大器的设计  

Design of a BiCMOS Optically Coupled Isolation Amplifier

作　　者：成立[1] 徐志春[1] 李俊[1] 刘德林[1] 王振宇[1] 张荣标[1] 

机构地区：[1]江苏大学电气与信息工程学院,江苏镇江212013

出　　处：《半导体光电》2007年第5期613-616,644,共5页Semiconductor Optoelectronics

基　　金：国家"863"计划项目(2006AA10Z258)

摘　　要：设计了一种BiCMOS光隔离放大器,给出了其中两个运算放大器的设计电路。设计过程中只在推拉式输出级配置两个双极型晶体管(BJT),而在电路的其余部分则设置CMOS器件。为了提高放大器的增益线性度和稳定性,光电耦合部分和各运放中都引入了负反馈,并采取了优选元器件参数和提速等措施。实验结果表明所设计光隔离放大器的±3 dB带宽比双极型光隔离放大器ISO100增加了约20 kHz,当电源电压为8.6 V时,时延-功耗积比ISO100降低了约17.7pJ,增益线性度提高到5.5×10-5,因此特别适用于高速通信系统中。A kind of novel BiCMOS optically coupled isolation amplifier was designed and 2 operational amplifier circuits were given. 2 bipolar junction transistors（BJT） were just set on the push-pull output circuit, but CMOS devices were set up for the rest parts. To improve the gain linearity and stability of the amplifier, negative feedback was introduced in the optical coupler part and each operational amplifier, and some measures such as components parameters optimization and speed-up were taken. The experimental results show that the± 3 dB bandwidth of the designed BiCMOS amplifier is increased by about 20 kHz than BJT optical isolation amplifier ISO100, and when the supply voltage of the inner operational amplifier is 8.6 V, the delay-consumption-product is 17.7 pJ and the gain linearity is increased by 5.5 ×10 ^-5 compared with ISO100. So the designed BiCMOS amplifier is very suitable for high-speed communication system.

关 键 词：双极互补金属氧化物半导体器件 光电耦合隔离放大器 时延-功耗积 高速通信系统 

分 类 号：TN433[电子电信—微电子学与固体电子学]