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some questions about HMC943A

Question asked by Bebetter on Dec 28, 2017
Latest reply on Jan 23, 2018 by Bebetter

Hi all

when i use HMC943A, i find the detector voltage of  Vref-Vdet  is not correct.

 

i connect the Vref with a 40.2k resistor to Vdd (5V),and i connect the Vdet with a 40.2k resistor to Vdd too.

 

then i use multimeter to measure the voltage between Vref and Vdet,

 

i find that when i decrease the input  power of the HMC943A,and the output power of HMC943A also become lower.

but the voltage between Vref and Vdet become higher. 

 

the figure below show that  the higher the output power ,the higher the voltage 

So i don't konw why the test result is not correct?

 

Look forward for your reply

Thanks .

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