ADF4159EB3Z

Hi Komal, 

Can you measure the VTune voltage and also share the ADISimPLL file

This might be related to PFD polarity if you have the inverting active loop filter. Can you try changing the PFD polarity to negative?

Additionaly, 

reading a 5V from a 3V test point is not a good sign. U2 chip is an LDO. Can you verify that all the supplies are connected correctly?

Thanks,

Emrecan

Vtune voltage is 5 volts (ofcourse after giving supply to Op-amp as 5V))
PFD polarity is already at negative
All the supplies r connected correctly and also except testpoint of 3V at U2 rest all r recieving excatly the mentioned voltage

plz can someone answer to  my question

Hi Komal, 

If U2 output is 5V, U2 LDO is faulty or there is a short from the 5V to VP or V3 supply bus. 

I would not have known what happened to the circuit without knowing your modifications. 

The best-case debug scenario would be removing R56 to bypass the U2 and then supplying 3V externally. If the chip is unharmed from 5V, it should work. 

Thanks,

Emrecan

I was supplying power to the HMC515 evaluation board using a male-to-female connector, but the connection was loose, which prevented the board from drawing current. However, it's now functioning correctly.

Another issue has arisen with the EB3Z board. There is no voltage detected at pin 6 of the OP184 IC. I checked the continuity across all the resistors and capacitors using a multimeter, and everything appears continuous. Pin 7 is receiving the correct input voltage, and pin 4 is grounded.

Could you suggest what might be causing this issue and possible alternatives to resolve it?

I was supplying power to the HMC515 evaluation board using a male-to-female connector, but the connection was loose, which prevented the board from drawing current. However, it's now functioning correctly.

Another issue has arisen with the EB3Z board. There is no voltage detected at pin 6 of the OP184 IC. I checked the continuity across all the resistors and capacitors using a multimeter, and everything appears continuous. Pin 7 is receiving the correct input voltage, and pin 4 is grounded.

Could you suggest what might be causing this issue and possible alternatives to resolve it?

Hi Komal,

I apologize for the late reply. 

what do you mean by "there is no voltage detected at pin 6"? Are measuring 0V at pin 6? 

If you are measuring 0v I recommend measuring Pin 2 of the opamp. 

If the voltage at pin 2 is also 0V, I recommend checking the PLL N divider and R Divider configuration. It might be a result of incorrect PLL settings and ADF4159 tries to slow down the VCO by setting Vtune to 0V due to the incorrect loop configurations. 

Another point about the active loop filter is setting the PFD polarity to negative as opamp is in the inverting configuration? Did you set the Register 3 PFD polarity bit to negative? 

 Thanks,

Emrecan