| Monolithic Active Pixel Sensors(MAPS)are one of the most advanced particle detectors.It has the advantages of high spatial resolution,fast time response,low material rate,and high radiation resistance.Hence,MAPS has been intensively used in vertex detectors in large-scale physical experiments and is widely applied in aerospace,medical,and other applications.However,the MAPS chips are under restrict embargoed against China,so it is necessary to develop high-performance MAPS chips independently.Due to the very high event rate of MAPS,a large amount of data needs to be processed and transmitted in physics experiments,so designing its on-chip data transmission paths is crucial.With the substantial increase in event rate and brightness in high-energy physics experiments,the performance requirements of data transmission paths in MAPS are also increasing.This paper designs a 5 Gbps serial data transmission block in a domestic MAPS chip.First,the parallel data is encoded in this data link using a 16b/20 b encoder.Then,the data is converted to 5 Gbps high-speed serial data through a 20:1 parallel-to-serial converter and transmitted through an output driver.This data transmission block has an operating voltage of(1.2+/-10%)V with an overall power consumption of 51.7 m W.In addition,it has a total jitter of 8.97 ps and a full swing output voltage(VDIFF 800 m V).The results of post-simulations with full process conner in the temperature range of-40 ℃ to 120 ℃ demonstrate that the logic function of this data transmission block is correct and the data transmission is stable.Besides,a complete and clear data eye diagram can be obtained,which meets the requirements.This design is based on the only verified 130 nm CMOS process that can be used for MAPS design in China at the time of writing,and it can be integrated into the MAPS chip.This high-speed serial data transmission block has been designed and taped out.The maximum transmission rate of 5 Gbps and low power consumption has been achieved. |
