# Sampling time of AD and operation time of FPGA

**URL:** <https://www.ruby-forum.com/t/sampling-time-of-ad-and-operation-time-of-fpga/230344>\
**Category:** GNU Radio\
**Created:** [June 12, 2014, 3:21am UTC](https://www.ruby-forum.com/t/sampling-time-of-ad-and-operation-time-of-fpga/230344 "2014-06-12T03:21:05Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![jason\_sam](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/7993a0/32.png) [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\
**Post date:** [June 12, 2014, 3:21am UTC](https://www.ruby-forum.com/t/sampling-time-of-ad-and-operation-time-of-fpga/230344/1 "2014-06-12T03:21:05Z")

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Hi!

I am a student from China and I am studying the energy detection  
algorithm  
with USRP1 and RFX2400 on Gnuradio 3.3.0 and Ubuntu10.04. There is an  
index  
I want to know about the algorithm is Sensing Time including the  
acquisition time of the samples the algorithm needs and the computing  
time  
of the samples on PC( I can get the computing time with PAPI to count  
the  
number of clocks of CPU).  
So, I want to know the acquisition time of the samples which I think is  
the  
time from antenna to the daughter board and then to AD and to  
FPGA(including DDC and CIC) and to PC in the end.

Can someone give me some advice?  
And please forgive my poor English.

Xu Fei  
Beijing University of Posts and Telecommunications  
Mobile：+86-15210831508  
E-mail：removed\_email\_address@domain.invalid