AnsweredAssumed Answered

The PLL has no output?

Question asked by charliedu on Jul 29, 2016
Latest reply on Aug 9, 2016 by charliedu

Hi,

 

I'm using the EV-ADF4159EB3Z board with EVAL-HMC587LC4B to make a prototype of my project.

I set the VCO output frequency to 2800MHz, hoping to get an RFout at 5.6GHz.

I'm using the on board loop filter.

When I set LOL to 0, I get a logic high(1.75v) at MUXOUT. So I suppose the loop has been locked?

The problem is I can't get any out when I couple the VCO RFOUT to an antenna.

I have tested that the coupler, the amplifier and the antenna are all working fine.

Any hints? Thanks!

 

Charlie

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