Simulation and research on high-frequency crosstalk signals in position-sensitive photodetectors

As photodetectors rapidly develop towards high speed and huge scale, the signal frequency of digital circuits reaches hundreds of MHz or even GHz. As the operating frequency continues to increase, traditional microstrip lines cannot be simply regarded as metal lines and are prone to signal integrity problems. This paper uses HFSS (High Frequency Simulator Structure) software to establish a high-speed microstrip line crosstalk simulation analysis model. Based on this model, the crosstalk problem of discontinuous microstrip lines under high-frequency conditions is studied, and its near-end crosstalk (S31) and far-end crosstalk (S41) are obtained. The influence of signal frequency, microstrip line thickness, microstrip line width, and microstrip line spacing on the crosstalk intensity is analyzed. The results show that the crosstalk intensity of discontinuous microstrip lines increases first and then tends to be flat with th 1e change of signal frequency; the near-end crosstalk S31 shows an increasing trend with the increase of microstrip line thickness; the near-end crosstalk S31increases with the increase of microstrip line width; the crosstalk intensity decreases with the increase of microstrip line spacing.