在标准互补金属氧化物半导体(complementary metal oxide semiconductor,CMOS)工艺下设计了1种单片集成金属-半导体-金属(metal-semiconductor-metal,MSM)光电探测器的光接收机.带有源反馈和负米勒反馈电容的跨阻前置放大器用来提高光接收机的带宽.由于MSM光电探测器具有较高的响应度,所以光接收机的灵敏度得到改善.由于MSM光电探测器的寄生电容较小,在特许半导体0.35μm工艺下实现了带宽为1.7GHz的光接收机.测试结果表明,在-15dBm的光功率和误码率为10-9的条件下,光接收机的数据传输速率达到了2Gb/s.在3.3V电压下,芯片的功耗为94mW.
A monolithically standard complementary-metal-oxide-semiconductor (CMOS) optical receiver with a metal-semiconductor-metal (MSM) photodetector is presented in this paper.An active-feedback transimpedance amplifier (TIA) with negative Miller capacitance is used to increase the bandwidth of the receiver.The MSM photodetector with high responsivity provides higher sensitivity for the optical receiver.The optical receiver implemented in chartered 0.35 μm process achieves a 1.7 GHz bandwidth due to the low capacitance of the MSM photodetector.2 Gb/s optical data are successfully transmitted with a bit-error rate of 10-9 at an optical power of-15 dBm.The power consumption of the receiver is 94 mW under a single 3.3 V supply.
XIAO XinDong ZHANG ShiLin MAO LuHong XIE Sheng CHEN Yan
A novel superimposed photodetector(PD)is put forward.The photodetector can obtain a couple of differential photocur-rent signals from one input optical signal.The light injection efficiency and the vertical work distance of this new photode-tector are much higher than those of the others.The superimposed photodetctor is designed based on the standard 0.18μm CMOS process.The responsivity,bandwidth and transient response of the photodetector are simulated by a commercial simulation software of ATLAS.The responsivities of two obtained photocurrent signals are 0.035 A/W and 0.034 A/W,while the bandwidths are 3.8 GHz and 5.2 GHz,respectively.A full differential optical receiver which uses the superim-posed photodetector as input is simulated.The frequency response and 4 Gbit/s eye diagram of the optical receiver are also obtained.The results show that the two output signals can be used as the differential signal.
