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您好、TI 团队、
将 AFE7950EVM 与 TSW14J57EVM 搭配使用时、通道 FB1和 FB2存在一些与输入相关的杂散
我使用了 AFE79xx_1x2FB_44210;数据速率= 491.52M -->以便采集2个 FB 通道
下图是 HSDC Pro 中的 ADC FB2通道输出。
输入= 9.5GHz (-25dBFS)
输入= 9.51GHz (-25dBFS)
输入= 9.52GHz (-25dBFS)
输入= 9.53GHz (-25dBFS)
输入= 9.54GHz (-25dBFS)
输入= 9.55GHz (-25dBFS)
输入= 9.56GHz (-25dBFS)
输入= 9.57GHz (-25dBFS)
输入= 9.58GHz (-25dBFS)
Latte 启动文件(OnboardClk_RX_250m)
############## Read me ############## #In HSDC Pro DAC tab, Select AFE79xx_2x2TX_44210; Data Rate = 491.52M #In HSDC Pro ADC tab, Select AFE79xx_2x2RX_24410; Data Rate = 245.76M ---> To capture 4 RX channels #In HSDC Pro ADC tab, Select AFE79xx_1x2FB_44210; Data Rate = 491.52M ---> To capture 2 FB channels sysParams=AFE.systemParams sysParams.__init__();sysParams.chipVersion=chipVersion setupParams.skipFpga = 1 # setup FPGA (TSW14J56) using HSDC Pro ############## Top Level ############## sysParams.FRef = 491.52 sysParams.FadcRx = 2949.12 sysParams.FadcFb = 2949.12 sysParams.Fdac = 2949.12*4 sysParams.externalClockRx=False sysParams.externalClockTx=False ############## Digital Chain ############## ##### RX ##### sysParams.ddcFactorRx = [12,12,12,12] #DDC decimation factor for RX A, B, C and D sysParams.rxNco0 = [[9500,9500], #Band0, Band1 for RXA [9500,9500], #Band0, Band1 for RXB [9500,9500], #Band0, Band1 for RXC [9500,9500]] #Band0, Band1 for RXD ##### FB ##### sysParams.ddcFactorFb = [6,6] #DDC decimation factor for FB 1 and 2 sysParams.fbNco0 = [9500,9500] #Band0 for FB1 and FB2 ##### TX ##### sysParams.ducFactorTx = [24,24,24,24] #DUC interpolation factor for TX A, B, C and D sysParams.txNco0 = [[9500,9500], #Band0, Band1 for TXA [9500,9500], #Band0, Band1 for TXB [9500,9500], #Band0, Band1 for TXC [9500,9500]] #Band0, Band1 for TXD ############## JESD ############## ##### ADC-JESD ##### sysParams.jesdSystemMode= [1,1] #SystemMode 0: 2R1F-FDD ; rx1-rx2-fb -fb #SystemMode 1: 1R1F-FDD ; rx -rx -fb -fb #SystemMode 2: 2R-FDD ; rx1-rx1-rx2-rx2 #SystemMode 3: 1R ; rx -rx -rx -rx #SystemMode 4: 1F ; fb -fb- fb -fb #SystemMode 5: 1R1F-TDD ; rx/fb-rx/fb-rx/fb-rx/fb sysParams.jesdTxProtocol= [0,0] # 0 - 8b/10b encoding; 2 - 64b/66b encoding sysParams.LMFSHdRx = ["24410","24410","24410","24410"] # The 2nd and 4th are valid only for jesdSystemMode values in (0,2). # For other modes, select 4 converter modes for 1st and 3rd. sysParams.LMFSHdFb = ["22210","22210"] sysParams.rxJesdTxScr = [True,True,True,True] sysParams.fbJesdTxScr = [True,True] sysParams.rxJesdTxK = [16,16,16,16] sysParams.fbJesdTxK = [16,16] sysParams.jesdTxLaneMux = [0,1,2,3,4,5,6,7] # Enter which lanes you want in each location. # For example, if you want to exchange the first two lines of each 2T, # this should be [[1,0,2,3],[5,4,6,7]] ##### DAC-JESD ##### sysParams.jesdRxProtocol= [0,0] sysParams.LMFSHdTx = ["44210","44210","44210","44210"] sysParams.jesdRxLaneMux = [0,1,2,3,4,5,6,7] # Enter which lanes you want in each location. # For example, if you want to exchange the first two lines of each 2R # this should be [[1,0,2,3],[5,4,6,7]] sysParams.jesdRxRbd = [4, 4] sysParams.jesdRxScr = [True,True,True,True] sysParams.jesdRxK = [16,16,16,16] ##### JESD Common ##### sysParams.jesdABLvdsSync= True sysParams.jesdCDLvdsSync= True sysParams.syncLoopBack = True #JESD Sync signal is connected to FPGA ############## GPIO ############## sysParams.gpioMapping = { 'H8': 'ADC_SYNC0', 'H7': 'ADC_SYNC1', 'N8': 'ADC_SYNC2', 'N7': 'ADC_SYNC3', 'H9': 'DAC_SYNC0', 'G9': 'DAC_SYNC1', 'N9': 'DAC_SYNC2', 'P9': 'DAC_SYNC3', 'P14': 'GLOBAL_PDN', 'K14': 'FBABTDD', 'R6': 'FBCDTDD', 'H15': ['TXATDD','TXBTDD'], 'V5': ['TXCTDD','TXDTDD'], 'E7': ['RXATDD','RXBTDD'], 'R15': ['RXCTDD','RXDTDD']} ############## LMK Params ############## lmkParams.pllEn = True lmkParams.inputClk = 983.04 # Valid only when lmkParams.pllEn = False lmkParams.lmkFrefClk = True setupParams.fpgaRefClk = 245.76 # Should be equal to LaneRate/40 for TSW14J56 ############## Logging ############## logDumpInst.setFileName(ASTERIX_DIR+DEVICES_DIR+r"\Afe79xxPg1.txt") logDumpInst.logFormat=0x1 #Modify to 0x1 to save register scequence to log file. Script takes more time to execute. logDumpInst.rewriteFile=1 logDumpInst.rewriteFileFormat4=1 device.optimizeWrites=0 device.rawWriteLogEn=1 device.delay_time = 0 #-------------------------------------------------------------------------------------------------# setupParams.skipLmk = False AFE.initializeConfig() lmkParams.sysrefFreq = AFE.systemStatus.sysrefFreq lmkParams.lmkPulseSysrefMode = False AFE.LMK.lmkConfig() ## Initiates AFE79xx Bring-up setupParams.skipLmk = True sysParams.txEnable = [False,False,False,False] AFE.deviceBringup() AFE.TOP.overrideTdd(15,3,15)
如何消除 FB1和 FB2通道中的这些输入相关杂散?
谢谢~
你好,奈文,
因为 输入 频率每增加1MHz、杂散频率就降低-1MHz。 通过该行为、看起来 这是时钟混合杂散。 我将在 TI 实验室对其进行测试、然后给您回复。
此致、
维贾伊