Abstract
Along with the improvement of technology, people start to realize the importance and need of high data rate transfer, the Optical Fiber Communication provides the property of high bandwidth interface and has no weakness of Electric Telecommunications interface, and therefore, the Optical Fiber Communication System plays an important role for the public nowadays. However, at present, integrated Photo Detector and TIA/LA into the same chip from Optical receivers still have many problems no matter for the academia or technology industry. Among them, the biggest challenge is the limited by the bandwidth. If we want to have larger photo current, then we certainly need to aggrandize the area of the photo detector, meanwhile, the parasitic capacitance of the photo detector will become larger, and directly influence the bandwidth of whole optical receiver. Because currently most optical receivers are formed with several modules, and the photo detectors are mostly using III-V group compound as the main component, there’s no doubt that the cost raised a lot. This paper describes the design of a fully integrated 10Gb/s optical receiver, use the optoelectronic property of SiGe HBT, which is better than CMOS, can minimum the area of the photo detector, then parasitic capacitance can reduce,it also has rather high, very proper for designing high-speed circuit. Consequently, this paper uses TSMC 0.35μm SiGe BiCMOS 3P3M process, which is cheaper than III-V group compound and 0.18 um CMOS to implement a fully integrated 10Gb/s optical receiver with high speed, high integration and high data rate. The design is a fully integrated optic receiver with PD, TIA and LA. The result of the receiver post-simulation provides a conversion gain of 118.284dBΩ and a 3 dB bandwidth of the 9.9 GHzs. The low-frequency cutoff is 78 KHz, the differential voltage swing is 1275 mV, data jitter is 5 ps .Total current consumption is 78.16 mA . The result of the Limiting amplifier post-simulation provides a gain of 63dB and a 3 dB bandwidth of the 14.5 GHz. Total current consumption is 54.12 mA .