应用于10Gb/s光接收机的全差分CMOS跨阻前置电路设计

设计了一种的低成本、低功耗的10 Gb/s光接收机全差跨阻前置放大电路。该电路由跨阻放大器、限幅放大器和输出缓冲电路组成,其可将微弱的光电流信号转换为摆幅为400 mVpp的差分电压信号。该全差分前置放大电路采用0.18 m CMOS工艺进行设计,当光电二极管电容为250 fF时,该光接收机前置放大电路的跨阻增益为92 dB,-3 dB带宽为7.9 GHz,平均等效输入噪声电流谱密度约为23 pA/(0~8 GHz)。该电路采用电源电压为1.8 V时,跨阻放大器功耗为28 mW,限幅放大器功耗为80 mW,输出缓冲器功耗为40 mW,其芯片面积为800 m1 700 m。

Design of a fully differential CMOS transimpedance preamplifier for 10 Gb/s optical receiver

A low cost and low power consumption optical receiver differential transimpedance preamplifier for 10 Gb/s high-speed optical communications application was presented. The preamplifier includes a tranimpedance amplifier(TIA), limiting amplifier(LA), and output buffer, the weak photo-current was amplified by the preamplifier to a differential voltage swing of 400 mVpp. The preamplifier was designed in 0.18 m CMOS technology. The receiver preamplifier circuit is with a transimpedance gain of up to 92 dB and -3 dB bandwidth of 7.9 GHz, which accommodates a photodiode capacitor of 250 fF. The noise simulation result shows that the average input-referred noise current spectral density is 23 pA/up to 8 GHz. The power dissipation of transimpedance amplifier, limiting amplifier and output buffer respectively drain is 28 mW, 80 mW, and 40 mW from the 1.8 V supply respectively. The chip size is 800 m1 700 m.