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some questions  about ADF4159

Question asked by Bebetter on Mar 22, 2018
Latest reply on Apr 4, 2018 by Bebetter

Hi ,all

 

when i use ADF4159 to generate a chirp signal(FMCW signal), because my loop filter is so narrow that the lock time is too long.  My chirp time is very quickly. so i should improve the lock time . But how can i  improve the lock time of ADF4159 and also do not change the loop filter because of phase noise. 

 

i see it has CSR can improve the lock time . but when i open it , the loop is unlock.

 

The VCO is positive ,i have used the input divider buffer and i only set DB28 of register 2  to one.

 

Do i need  to set anything else?

 

Thankyou

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