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HMC981LP3E has no correct output

Hi, I used the HMC981LP3E for controlling bias on the HMC460LC5 Follow the circuit recommended by AN-1363,But HMC981 has no correct output.

The test results are as following:

1.VDD is 8.75V and VDIG is 5V.

2.VNEG =+0.8V,VGATE=+0.7V(The output of VGATE is  a negative voltage bewteen -2 to 0V theoretically

3.VDRIN  has no output .(In fact, its test value is equal to +0.15V)

Did I do something wrong,or was there something I ignored?

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