Four-channel high-speed synchronous FMC acquisition device

Abstract

The invention discloses a four-channel high-speed synchronous FMC acquisition device, and relates to acquisition devices in the fields of measurement and control, communication and the like. Accordingto the technical scheme, an AD acquisition circuit converts a single-ended signal into a differential signal which can be received by an AD chip through a two-stage transformer by using four paths ofinput signals, and a clock shunt circuit outputs a sampling clock and a sampling synchronization signal required by an analog-to-digital converter AD through frequency multiplication and frequency division. Meanwhile, two groups of AD sampling clocks and AD sampling synchronization signals are respectively sent to corresponding AD chips, synchronization data is sent to an FMC connector, and a data processing clock is sent to a signal processing carrier plate; the FMC connector configures a value required for working of an AD chip register through a serial peripheral interface SPI, two groupsof synchronous signals of AD data transmission are respectively provided for corresponding AD, after the AD works normally, data of four output channels are sent to a carrier plate through an FMC connector plug, and synchronous sampling and transmission of four paths of intermediate frequency data are completed.

Description

technical field

[0001] The invention relates to the fields of measurement and control, communication and the like and a high-speed four-channel synchronous data acquisition device. Background technique

[0002] The fixed network and mobile network convergence FMC acquisition board is a general-purpose board module designed to provide standard mezzanine board sizes, connectors and module interfaces for FPGAs on the base board (carrier card), in this way the i The / o interface is separated from the fpga. In measurement and control and communication systems, the sampling frequency, synchronization, and transmission rate of data acquisition have a great impact on sampling, thereby affecting the accuracy and accuracy of positioning. Most of the existing acquisition card interfaces are PCI bus, ISA bus, 1394 bus, etc., which are expensive and difficult to develop. In addition, the existing FMC acquisition boards have fewer analog input channels, lower acquisition accuracy, and h...

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