低噪声1.25Gb/s光接收机前端放大器

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.

A Low Noise,1.25Gb/s Front-End Amplifier for Optical Receivers

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.