Design Of AXIe Bus Broadband High-speed Acquisition Instrument Module

AXIe bus is a new instrument bus developed in response to the testing of complex electronic systems,characterized by single slot area and power,intelligent management,high data transfer rate,which supports large-scale broadband testing and greatly facilitates complex test.Aiming at application of broadband RF signals,this thesis proposes a dual channel high-speed acquisition platform based on AXIe bus,including broadband acquisition,resampling baseband processing and high-rate transfer link.On the basis of AXIe instrument bus standard,combined with the requirements of the development goal,the overall scheme of broadband high-speed acquisition instrument module AXIe-based is determined,which makes full use of the characteristics of AXIe instrument bus,such as large data bandwidth and clock/trigger resources.For dual channel high-speed and high-precision acquisition,the analog-to-digital converter supporting JESD204 B protocol is selected to realize the real-time sampling requirements of 6.4 GSPS.The design includes the protocol receiver and acquisition control logic,the clock group meeting the needs of the protocol,the acquisition link establishment and synchronization between channels realized by deterministic delay.For the baseband process,the thesis proposes a parallel down conversion structure suitable for high-speed data with a parallel NCO on look-up table whose frequency/phase is fine tuneable;By the polynomial fitting of high-order interpolation filter,the Farrow filter is reliazed for resampling to meet the processing of communication signals.High rate sampling data ask for high-speed upload link.The PCIe of AXIe bus ZONE2 is selected as the data link and an xcku060 chip acts as the data hub.The highspeed data interchange on PCIe 2.0 x4 protocol is reliazed by xdma IP logic.The clock/trigger control logic with trigger,timing and SYNC signals of ZONE2 realizes the trigger and synchronization of modular acquisition instrument.The logic of whole AXIe acquisition instrument are tested to verify the correctness:parallel NCO covering 0-500 MHz,arbitrary oversampling rate on Farrow filter,data upload link rate,the overall control set and trigger/sync interface etc.The test results show that the functions achieve the expected design goal.