| With the rapid development of the semiconductor technology, for both the military aerospace equipment and the civilian consumer electronics devices, the system integration is becoming increasingly high. At the same time, the CPU frequency is becoming higher and higher and the power supply voltages is becoming lower and lower. Therefore, various signal integrity problems and power integrity issues can be encountered unavoidably in the design and implementation of high-speed digital circuit system. Our research background is the designing of a suit of space camera video test equipment. Based on the classic signal integrity and power integrity theory, the main works and contributions of this paper are as follows:The problems of the short transmission distance of multi-channel high-speed space camera and the high transmission bit error ratio are solved. An active equalization scheme at the receiver end is proposed and implemented. First of all, the non-dc-balanced characteristic of image data signal is analyzed. Based on the measurement data of the long transmission cable its mathematics model is created. According to the attenuation characteristics of this model an equalization circuit is designed, which make use of the high gain of the differential high-speed amplifier and the frequency selecting characteristics of the phase lead feedback network to flatten the frequency response of the long distance transmission channel. The simulation results show that the maximum data rate of the transmission channel can be expended to 250Mbps with the equalization. Besides, the eye diagram measurement results also show that the inter-symbol interference from transmission media is significantly reduced after equalization, resulting in an open eye diagram with reduced jitter and crisp edges. Finally, by observing Signal Tap logic analyzer, sending grayscale and actual picture, it has been verified that the error-free transmission distance can reach 80m at 250Mbps.In order to verify and assess the reliability of high-speed serial signal transmission of space camera test equipment, a modeling and co-simulating method for high-speed signal link is proposed. Firstly, the mixed models of the high-speed serial link are established, including the high-speed transceiver SPICE model, the RLGC model of the bonding wire connecting the transceiver die with the solder bump, the scattering parameter model of PCB extracted by SIwave, SATA connector model and SATA cable model. Then based on ADS simulation platform, the impacts of the signal link and each interconnection on the high-speed transmission are analyzed by the scattering parameter simulation in frequency domain and the eye diagram simulation in time domain. Both simulation results show that this transmission link supports the maximum data rate of Rapid 10 at 3.125Gbps, and the measured bit error rate is less than 10E-14.Via transiting structure can degrade the high-speed signal quality and increase the noise coupling between the signal and power/ground plane. In this paper, various solutions for via transiting are modeled, simulated, analyzed and compared on a unified experiment platform. Then, a novel via transiting structure which is composed of electromagnetic band gap and decoupling array is proposed. In frequency domain, the S parameter measurement results show that the proposed four-layered structure has an ultra-wide bandwidth covering 0?8.5GHz with a insertion loss fluctuation less than 0.4dB, and the coupling between signal and power/ground plane is less than -20dB in the worst case. Besides, in the time domain, the signal waveform and the coupled noise waveform also show its advantages in signal integrity and power integrity. Finally, the comparisons of eye diagrams and the related eye parameters once again prove that the structure has an excellent signal transmission characteristics and power supply noise rejection characteristics.The relationship between the geometry parameters of the coplanar electromagnetic band gap (EBG) structure and its electromagnetic characteristics is investigated, and an EBG synthesis procedure is introduced. Through the high performance cuckoo search (CS) algorithm and based on the EBG design procedure, in this paper, the automatic EBG design and its parameters' rapid optimization are presented. According to the comparison and analysis of the optimized result and the electromagnetic simulation result, the root cause of the deviation of the analytical computation result is pointed out, and an improved analytical computation method is proposed. First of all, a RLC equivalent circuit model of the EBG structure is established, and is tentatively proven to be reasonable and effective by SPICE simulation. Then the EBG's scattering parameter can be obtained by solving the model's impedance matrix based on Matlab platform, and the band gap lower limit of the EBG can be analytically solved. Finally, by compared with the HFSS electromagnetic simulation results, the proposed analytic computation method is turned out to have high precision, and this method can make the EBG design and optimization results more accurate and reliable.In this paper, the proposed solution for high-speed signal transmission over long distance, the proposed approach to modeling and simulation for high-speed serial link, the proposed ultra-wide-band via transiting structure and the proposed optimization algorithm for EBG structure are all verified by experiments and have been successfully applied in the space camera video test equipment. Besides, all the solutions and methods proposed in this paper are also suitable for some other kinds of high-speed digital circuit system, and have a good application value. |
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