10Gb/s光接收机跨阻前置放大器芯片设计研究

采用0.18 μm BiCMOS工艺设计并实现了一种高增益、低噪声、宽带宽以及大输入动态范围的光接收机跨阻前置放大器.在寄生电容为250 fF的情况下,采用全集成的四级放大电路,合理实现了上述各项参数指标间的折中.测试结果表明:放大器单端跨阻增益为73 dB,-3 dB带宽为7.6 GHz,灵敏度低至-20.44 dBm,功耗为74 mW,最大差分输出电压为200 mV,最大输入饱和光电流峰-峰值为1 mA,等效输入噪声为17.1 pA/√Hz,芯片面积为800 μ.m×950μm.

Study on Design of the Transimpedance Preamplifier Chip for 10Gb/s Optical Receiver

A high gain,low noise,wide bandwidth and large input dynamic range transimpedance amplifier was designed and implemented by using 0.18μm BiCMOS technology.With a parasitic capacitance of 250 fF,the main amplifying circuit,two-stage differential amplifier circuit and output buffer circuit structure were used to realize the good tradeoff between gain,bandwidth,noise and dynamic range.The testing results indicated that the single end transimpedance gain was 73 dB,the-3 dB bandwidth was 7.6 GHz,the sensitivity was as low as -20.44 dBm and power consumption was 74 mW.The maximum differential output voltage was 200 mV,the maximum input saturated photocurrent 1 mA,the equivalent input noise was 17.1 pA/√Hz and the die size was as small as 800 μm×950μm.