I found that the phone has peak phase error and switching spectrum fail under low voltage (3.4V). It happend at maximum power level. I have checked the PA output matching, it's already very "matched". Actually I have tried to tune the output matching but no effect on this problem.
hello every body. I have proplem about peak phase. My mobile design have peak phase > 20° and phase of bit 0 usually > 20° and bit 1->147 usually 2°-3°. i try to control every thing but it not good. Can you help me, as soon as ? thanks you every body .