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HMC952A damage during test

Question asked by wangzhiluck on Jul 7, 2018

I make a power amplier use HMC952A,Vdd1~Vdd4 connected together to power supply 6V,and Vgg1~Vgg3 connected together to negative power supply.The device mounted on Rogers ro4003c circuit board,and circuit board mounted on aluminum heat sink plate.During the test, it was found that the amplifier suddenly had no gain.At this point, check the circuit and find that HMC952A has been damaged.Three devices have been damaged in a row.I don't know what a good way to solve this problem.