High-speed differential signal conversion circuit for remote sensing ccd camera

Abstract

Remote sensing CCD camera high-speed differential signal conversion circuit, the circuit uses AC coupling to transmit signals, which can meet the requirements of short-distance signal transmission and long-distance signal transmission between devices. The circuit uses a DC discharge channel to provide a current output channel for the signal sending end, uses a voltage divider network to provide the required common-mode voltage and differential-mode voltage for the signal input end, uses a matching network to match the impedance of the high-speed differential signal, and passes the above network to the output Signal processing, so that the high-speed differential signal output by the sending end that does not meet the receiving requirements is processed into a signal that can meet the level requirements of the receiving end. The high-speed differential signal conversion circuit of the remote sensing CCD camera has the characteristics of high reliability, simple use of devices, small footprint, flexible adjustment, strong adaptability, long transmission distance, and good isolation performance while realizing high-speed signal conversion. Meet the requirements of aerospace applications.

Description

technical field [0001] The invention relates to a high-speed differential signal AC conversion circuit, in particular to a high-speed differential signal AC conversion circuit used in a remote sensing CCD camera. Background technique [0002] At present, differential signals of multiple levels are used simultaneously in the design of the video circuit of the space remote sensing CCD camera. These differential signals are mostly used for data communication between high-speed chips. Because space remote sensing CCD cameras use very few types of aerospace-grade chips, there is often a problem that the differential signal level standards between the two chips that need to communicate are inconsistent, and they cannot be directly connected to achieve communication. This requires a level conversion circuit to convert the level standard of the sending end into the level standard of the receiving end to realize signal transmission between the two. In previous space remote sensing ...

AI Technical Summary

Problems solved by technology

First of all, the premise of this method is that there needs to be an FPGA in the circuit, and it cannot be used in a circuit without an FPGA; secondly, with the continuous upgrading of FPGA devices, the types of level standards that pins can provide will also change. There is a situation that the level standard of the external circuit cannot be matched after the FPGA is upgraded; third, in some cases with high requirements, the use of FPGA to convert the signal will increase the jitter of the signal and reduce the product index

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