PLL NOT WORKING IN TEMPERATURE

Jayaprakash on Oct 11, 2014

Sir,

Pls help to find an unlocking issue in PLL ckt using AD4156 and HMC587 VCO.It became unlock b/w the temperature range of +17 to +20 C.Freq is 5.5GHZ.It is working fine above and below this range.

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Jayaprakash Oct 31, 2014 +1

Sir,

Finally I could find out the problem.The pad of LNA detached (very very small portion) from the body.The image attached is taken using a magnifier having 110 zoom.HMC 587 output is divided using…

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0 ADIApproved

on Oct 13, 2014 5:40 PM
Can you isolate the problem to see if it is the ADF4156 or the HMC587 that is failing?

Is there any output from the VCO at these temperatures? Are all the supply pins at the correct voltage?

For the PLL, can you program the various Muxout modes? i.e. when the loop is failing, can you program DVDD and GND on Muxout and measure them with a multimeter?
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0 ADIApproved

on Oct 13, 2014 5:40 PM
Can you isolate the problem to see if it is the ADF4156 or the HMC587 that is failing?

Is there any output from the VCO at these temperatures? Are all the supply pins at the correct voltage?

For the PLL, can you program the various Muxout modes? i.e. when the loop is failing, can you program DVDD and GND on Muxout and measure them with a multimeter?
Cancel
Up 0 Down

Reply

Verify Answer

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