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AD9361 BBPLL can't locked stably

Question asked by FangTianqi on Dec 17, 2017
Latest reply on Jan 12, 2018 by srimoyi

Hi,mans.I have a problem with my BBPLL of AD9361.I configed all registers with FPGA. So far the BBPLL can locked stably.But it becomes unstably when I move from ALERT to FDD. Or say when AD

9361 TX RX Channel is open。I read 05E[7] can be 1 or 0 and irregular.So that A

bad spectrum comes in my TX RF.but it works well when receiving single tone.

The situation in my board: 19MXTAL,1.3V LDO supply AGND is connected to DGND with two resister(0 European) in parallel。And all GND of AD9361 is AGND。I have checked my power supply and XTAL.

WHat's wrong with my board?Please help me to find it ,Thanks