I use ADP1755 to generate the 1.3 V for AD9364.
Based on the ad_fmcomms3_reva schematic, I design the AD1755 circuit to convert 2.5V to 1.3V as the following.
PS: D1V5 means 2.5 V source voltage.
For the larger board, everything works correctly.
However, for the smaller board, the output voltage is 1.5V, not 1.3V without loading.
I try to change R10 and R8 to 100K and 160K, but the output voltage is still 1.5V
Please show me clue to solve this problem ?