PCI-Express Digitizer Capable of Sustained Recordings Over 1.2 GByte/s

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PCI Express Digitizer Capable of Sustained Recordings over 1.2 Gbytes/s

A new high-speed digitizer in the form of an advanced wideband and high dynamic range A/D board captures signal frequencies up to 200 MHz, when using the programmable gain amplifier in 1 dB steps for maximum gain attenuation flexibility. Frequencies go up to 400 MHz if the direct transformer coupled connection is employed for the cleanest possible signal path to the ADC. The PX14400 from Signatec includes 1 Gbyte of onboard memory configured as a large FIFO and a PCIe x8 bus to ensure it can continuously sustain long recordings at over 1.2 Gbytes/s through the PCIe x8 bus to PC disk storage without any break in the analog record.

Of the two embedded Virtex-5 FPGAs, one is expressly available for custom in-line signal processing. As a Xilinx Alliance Program partner, Signatec created standardized data and control interfaces that are customer accessible along with VHDL source code examples that demonstrate the use of these interfaces to simplify real-time processing tasks through its optional firmware development kits.

Up to five PX14400 boards may be interconnected in a Master/Slave configuration via a ribbon cable that connects at the top of the board. In this configuration, clock and trigger signals from the Master board drive the Slave boards for synchronized sampling across all boards. Additional boards can be synchronized, even across computer chassis, when using Signatec’s Sync1500-6 product. The PX14400 supports single shot, segmented and pre-trigger triggering modes.

In Segmented Mode, “time stamps” allow for storing the time relationship between the memory segments. Time stamps are 64-bit timer values with a clock resolution of 5.0 nanoseconds, and are accumulated in a 2048 element FIFO memory separate from the data. If necessary, time stamps may be read during acquisition in order to prevent overflow. This is possible in any acquisition mode.

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