戴工:
你好! 我们现在测试过程中,发现在DPD运行过程中存在烧PA的现象,我们想使用AFE7769的TX PA Protection功能;
请问一下这个功能怎么使用?需要怎么设置门限参数?
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李工,
PAP的功能用下面这个C function. 具体int windowCntr,int errorCntr,int threshold, 这3个参数怎么设置我们内部需要内部确认一下,这周稍后给您回复
int configSrModeMovingAvg(int fd,int ulCh,int enable,int samples,int windowCntr,int errorCntr,int threshold){
/*
ulCh: 0=TXA,1=TXB,2=TXC,3=TXD
enable: 0/1=Disable,2=JPL mode,3=Abs mode
samples: Number of samples used for moving average PAP computation. 0:32Samples,1:64Samples,2:96Samples,3:128Samples
windowCntr: Moving average window counter running at interface rate/2 clock
errorCntr: Moving average error counter running at interface rate/2 clock
threshold: Moving average mode, accumulator threshold value above which PAP will be triggered for this mode
李工,
RU enable PAP的配置文件&bringup script在此:
bringup script:
configuration file:
PAP CAPI:
/cfs-file/__key/communityserver-discussions-components-files/119/configSrModeMovingAvg.c
Example settings,
Enable = 2 # JPL approximation
Samples = 0 // indicating 32 samples
windowCntr = 256
errorCntr = 16
threshold = 2560 (please check below lines for threshold calculation)
threshold_in_dBFS=-10 # dBFs
thr=int(32768*pow(10,threshold_in_dBFS/20.))
另外戴工,贵司的现在AFE7769D的自带DPD功能,现在在60W输出功率的情况下可以做到多少ACPR?前些天ADI这边发了一个3.5G的80W的功率的,用他们芯片自带DPD,ACPR可以做到-47dBc
我们测过3.85GHz FDD 56w BW 200MHz, 您提到的这个use case目前还没有测过. 如果需要提供AFE7769D的ACLR数据,需要你们跟TI-Sales签个NDA才能给.