High-speed signal sampling system

Abstract

The invention discloses a high-speed signal sampling system. The high-speed signal sampling system comprises a clock generation module, a frequency division unit, a frequency multiplication unit, an ADC module and an FPGA module; a clock signal output end of the clock generation module is connected to the frequency division unit and the frequency multiplication unit separately; a conversion clocksignal output end of the frequency division unit and a data clock signal output end of the frequency multiplication unit are connected to an analog signal input end of the ADC module; a digital signaloutput end of the ADC module is connected to the FPGA module; and the FPGA module includes two data channels, each of which is composed of a data receiving unit, a FIFO storage unit, and a serial-to-parallel conversion unit that are sequentially connected; the data clock signal output end is connected to the data receiving unit of each data channel separately, and the conversion clock signal output end is connected to the FIFO storage unit and the serial-to-parallel conversion unit separately. The high-speed signal sampling system is expanded to 16 channels through a dual channel sampling method, and finally the 64 channel 18 bit 5 MSPS acquisition system is reached; so that the sampling system has a high sampling rate, high contrast and high sampling accuracy.

Description

technical field [0001] The invention relates to the technical field of signal sampling, in particular to a high-speed signal sampling system. Background technique [0002] With the rapid development of terahertz technology, terahertz imaging has been used more and more widely. Compared with X-ray imaging, terahertz imaging has the advantages of low transmission power and no harm to the human body. At the same time, terahertz imaging also has the characteristics of high bandwidth. , maintaining the advantages of high resolution and fine imaging of X imaging, so it is more and more widely used in airports, high-speed rail and other security inspection fields and public security systems. [0003] Terahertz imaging puts forward higher requirements for the acquisition system: because of the large bandwidth, the acquisition system is required to have a higher sampling rate; and because of the large dynamic range and high contrast required by imaging, the acquisition system is requ...

AI Technical Summary

Problems solved by technology

[0004] As the core component of communication, radar and imaging systems, high-speed acquisition system has always been a hot spot and focus of research at home and abroad. Previous acquisition systems for communication and radar applications have a sampling accuracy of 14 to 16 bits and a sampling rate of 80 to 200 MSPS; For color Doppler ultrasound and other medical imaging systems, the ADC sampling accuracy is basically 12bit, and the sampling rate is >10MSPS; oscilloscopes and other measurement equipment require extremely high sampling rates (oscilloscopes with a bandwidth of 500M usually have a sampling rate exceeding 2.5GSPS), but the sampling accuracy is not high, usually Only need 8bit

[0005] High-precision acquisition system 18~24bit, usually in industrial measurement and other fields, such as scales, flowmeters, because a large dynamic range is required, usually requires 24bit resolution accuracy, but because the collected signal frequency is very low, usually below kHz, So the sampling speed of the ADC is not high (usually a few ksps to tens of ksps)

[0006] To sum up, it can be seen that for the acquisition system with a sampling accuracy of 18bit and a high sampling rate (5MSPS), there are not many researches due to fewer application fields.

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