10Gb/s GaAs PHEMT Current Mode Transimpedance Preamplifier for Optical Receiver

10Gb/s GaAs PHEMT电流模跨阻抗光接收机前置放大器(英文)

A single power supply common-gate （CG） current mode transimpedance preamplifier （TIA） is developed with a 0.5μm GaAs PHEMT process. The amplifier has a measured - 3dB bandwidth of 7. 5GHz and a transimpedance gain of 45dBΩ. Both the input and output voltage standing wave ratios （VSWR） are less than 2 within the bandwidth. The equivalent input noise current spectral density varies from 14.3 to 22pA/√Hz, with an average value of 17. 2pA/√Hz. Having a timing jitter of 14ps and eye amplitude of about 138mV,the measured output eye diagram for 10Gb/s NRZ pseudorandom binary sequence （PRBS） is clear and satisfactory.

采用0．5μm GaAs PHEMT工艺研制了一种单电源共栅电流模跨阻抗前置放大器（TIA）．测量得到放大器-3dB带宽为7．5GHz，跨阻增益为45dBQ；输入输出电压驻波比（VSWR）均小于2；等效输入噪声电流谱密度在14．3～22pA／√Hz之间，平均值为17．2pA／√Hz．在输入10Gb／s非归零（NRZ）伪随机二进制序列（PRBS）信号下，放大器输出眼图清晰，具有14ps的定时抖动和138mV的峰峰电压．