Local oscillator frequency sweep for ad9361 Transciever

Question

Hey I need guidance on ad9361 Lo frequency sweep. To elaborate my query I have divided it into several sections as follows; 
 What I am doing 
 Currently I am working to sweep the Local oscillator frequency of ad9361 over the range of 70Mhz to 6Ghz. 
 reference 
 For this I am using the spectrum_analyzer.c code as reference. I have also gone through UG570 and UG671. 
 Objective 
 My ultimate objective is to sweep the frequency over this full wide range with the help of c code or in Verilog on ad9361. 
 
 I need guidance to reach my objective. Despite going through the documents I have mentioned above, I am still not getting enough clarity on how to do it. Any kind of help would be appreciated! 
 Thankx

TANZI7702 · Accepted Answer

Hey mhennerich I am able to successfully visualize the Tx Lo sweep signal on the spectrum analyzer. The sweep range varies between 400MHz and 1100MHz. Now the problem is to minimize the sweep time. With the step size of 50KHz, and the delay between every frequency step is 1 microsecond, the entire sweep with these specs take 15 second time. I need to minimize it as minimum as upto 200ms time duration. Can you please guide me how to achieve that? Moreover, I need to know how minimum can I go with these specifications? 
 regards! 
 Tanzeela!)

TANZI7702 · Answer

Hey mhennerich , I am sweeping the tx from 400Mhz to 1100 Mhz. But I can only visualize the sweep on spectrum analyzer with the delay (sleep(1) ) of 1 second or greater. However, I want to lock the PLL as fast as possible. Moreover the default PLL lock time for ad9361 varries from 45 micro seconds to 60 micro seconds. Now tell me with this fast lock time how can I visualize it on the spectrum analyzer. 
 my spectrum analyzer (FSH8-2) allows to visualize as fast signals as that of 80ms.

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Local oscillator frequency sweep for ad9361 Transciever

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