摘要
This paper presents a low noise, 1.25Gb/s and 124dBΩ front-end amplifier that is designed and fabricated in 0.25μm CMOS technology for optical communication applications. Active inductor shunt peaking technology and noise optimization are used in the design of a trans-impedance amplifier,which overcomes the problem of inadequate bandwidth caused by the large parasitical capacitor of the CMOS photodiode. Experimental results indicate that with a parasitical capacitance of 2pF,this circuit works at 1.25Gb/s. A clear eye diagram is obtained with an input optical signal of - 17dBm. With a power supply of 3.3V, the front-end amplifier consumes 122mW and provides a 660mV differential output.
设计并实现了一种基于TSMC 0·25μm CMOS工艺的低噪声、1·25Gb/s和124dBΩ的光接收机前端放大器.跨阻放大器设计采用了有源电感并联峰化和噪声优化技术,克服了CMOS光检测器大寄生电容造成的带宽不够的问题.测试结果表明,在2pF的寄生电容下,前端放大器工作速率达到了1·25Gb/s ,在光功率为-17dBm的光信号输入下得到了清晰的眼图.芯片采用3·3V电压供电,功耗为122mW,差分输出电压幅度为660mV.
基金
国家高技术研究发展计划资助项目(批准号:2002AA312240)~~
