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ADF4007 frequency divider


I am using ADF 4007 as frequency divider.

I used configuration as mentioned in ADF4007 datasheet. Unfortunately, there is some problem: when 3.5 GHz is applied, device is working perfectly, but when input signal is off, ADF4007 generates itself frequency about 103 MHz. What is wrong?

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  • I have found additional information in the data sheet which I didn't see.  The 21k Ohm resistor does deque the capacitor but it did modify the biasing of the device by a very small amount.

    I am seeing an oscillation on the eval board at ~110MHz with input signal (RFinA) switched off.

    Do you have any guidance about this oscillation and it's squelching?

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