AL8XGTE-3 高速数据采集卡 总线的双通道 A/D 板

AL8xGTe 是用于 PCI Express x1 总线的双通道 A/D 板。它针对高速瞬态捕获进行了优化，采样率为 1、1.5、2 或 3 GSsamples/s，重复频率非常高。大型双端口板载缓冲存储器允许同时瞬态记录和读出捕获的数据。后处理部分可用于提取多个门的峰值信息，同时捕获的数据通过 PCI Express 总线传输到 PC 的主存储器中。模拟输入采用直流耦合，并以 50 欧姆阻抗端接，可在超过 1 GHz 的整个模拟带宽内实现高信号保真度。 输入电压范围可在 125mVp-p 至 2Vp-p 范围内编程。一个或两个分辨率为 8 位的 A/D 转换器以 1.0 或 1.5 Gsamples/s 的速度对输入信号进行采样。具有两个 A/D 转换器的板级版本可以以 1.0 或 1.5 Gsamples/s 的速度同时对两个输入通道进行采样，也可以以交错方式在同一通道上使用两个 A/D 转换器，以实现 2.0 或 3.0 Gsamples/s 的有效采样率。

采样数据存储在最多 4 Gsamples 的板载内存缓冲区中。此缓冲存储器的大小决定了采集的最大长度。该板将准备好在上一次采集结束后约 2 微秒接受触发，这允许短时间采集的重复率远高于 100 kHz。采样时钟在电路板上生成，不能在外部提供。750、500、375、333、250 Msamples/s 低至 244 kSamples/s 的较低采样率是通过在从缓冲存储器中读取采样数据时抽取采样数据而创建的。从缓冲存储器中读取数据与采集同时进行，不会影响重复率。

采样数据使用 DMA 通过 PCI Express 总线传输，因此无需 CPU 干预即可实现高传输速率。在此数据传输过程中，一组峰值检测器可用于监测样品流，并在选定的采样数据片段上提取峰位置和阈值交叉

AL8XGTE-3 高速数据采集卡 总线的双通道 A/D 板

The AL8xGTe is A dual-channel A/D board for the PCI Express x1 bus. It is optimized for high-speed transient capture with sampling rates of 1, 1.5, 2 or 3 GSsamples/s and very high repetition rates. Large dual-port onboard buffer memory allows simultaneous transient recording and readout of captured data. The post-processing part can be used to extract peak information for multiple gates, while the captured data is transmitted to the PC's main memory via the PCI Express bus. The analog inputs are DC coupled and terminated with a 50 ohm impedance for high signal fidelity over the entire analog bandwidth of more than 1 GHz. The input voltage range can be programmed from 125mVp-p to 2Vp-p. One or two 8-bit resolution A/D converters sample the input signal at 1.0 or 1.5 Gsamples/s. Board-level versions with two A/D converters can sample both input channels simultaneously at 1.0 or 1.5 Gsamples/s, or use two A/D converters on the same channel in an interlaced fashion to achieve an effective sampling rate of 2.0 or 3.0 Gsamples/s.

Sample data is stored in an on-board memory buffer of up to 4 Gsamples. The size of this buffer determines the maximum length of the collection. The board will be ready to receive the trigger about 2 microseconds after the end of the last acquisition, which allows for a repetition rate of much higher than 100 kHz for a short acquisition. The sampling clock is generated on the board and cannot be provided externally. The lower sample rates of 750, 500, 375, 333, 250 Msamples/s down to 244 kSamples/s are created by extracting the sample data when it is read from the buffer. Reading data from the buffer is done at the same time as the acquisition without affecting the repetition rate.

The sampled data is transmitted over the PCI Express bus using DMA, so high transfer rates are achieved without CPU intervention. During this data transfer, a set of peak detectors can be used to monitor the sample stream and extract peak locations and threshold crossings on selected sampled data segments