Physical interface board of high speed 1553B optical fiber bus
An optical fiber bus and physical interface technology, applied in optical fiber transmission, electromagnetic wave transmission systems, electrical components, etc., can solve the problems of difficult high-frequency signal sampling, low efficiency of short frame data, etc., and achieve the effect of preventing signal interference.
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[0020] The high-speed 1553B optical fiber bus physical interface board mainly includes optical fiber transceivers, FPGA logic devices, dual-row pins and other supporting components in structure. The system structure is as figure 1 Shown. In the specific implementation process, interface circuit design and FPGA logic design are the two most important design links, which will be explained separately below.
[0021] (1) Interface circuit part
[0022] The interface circuit part mainly realizes the correct conversion of the LVPECL level of the optical fiber transceiver to the LVTTL level of the FPGA. The key issue involved is the matching of the source end and the terminal resistance of the optical fiber transceiver.
[0023] According to the LVPECL standard, the impedance of the source device of the differential signal and the impedance of the terminal device must strictly meet specific requirements, otherwise the signal during transmission will ring or oscillate, and the integrity of t...
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