By PURPLELEC | 06 December 2023 | 0 Comments
How to choose a high-speed data acquisition card
In scientific research experiments, if high-frequency signal experiments are involved, high-speed data acquisition cards are generally selected, such as communications, Qualcomm physics, radar and other fields. When choosing a high-speed data acquisition card, the following indicators are generally considered:
Sampling rate, resolution, number of channels, bus, etc. The key to selection is to see what your high-speed data acquisition card is used for, and avoid blindly choosing a data acquisition card. Because different data acquisition cards are used in different places, you must first determine your purpose. Only when you know the purpose can you make a better selection. After the purpose is determined, search for the corresponding matching data acquisition card to see if its parameters suit your needs. Compare different models of acquisition cards so that you can select the one that is more suitable for you. The application of the data acquisition board is closely related to these keywords: signal type (pulse, intermediate frequency, radio frequency...), signal amplitude, signal bandwidth, whether FPGA real-time processing is required, number of channels...
Sampling rate: A very critical indicator. If it is a signal containing a DC component, the sampling rate is generally selected to be more than 8 times the signal frequency. If it is a communication modulated signal, it can be collected using undersampling. At this time, the main consideration is the bandwidth of the board card.
Resolution: Some users do not have high resolution requirements, such as satellite communications, etc.; some users are more sensitive to resolution, such as light pulse signal capture, etc. Usually the options are 8bit, 10bit, 12bit, 14bit, 16bit, etc.
Number of channels: For some array applications, the number of channels is a very critical factor. For example, ultrasonic arrays, phased array radars, distributed high-energy physical detection, etc. Of course, the synchronization requirements in this situation are also very high.
Bus: Users also need to choose an appropriate bus based on system size, budget, etc. For example, if it is a financial laboratory environment, you can choose PCIe, USB bus, etc.; if it is an industrial site or test site, you can choose cPCI, VPX, etc.
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