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did I get faulty amplifier question

yefj

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Hello, I have bought an amplifier shown below.However when I am trying to test if my VDD is shorted to GND my measuring i get the DMM beeping as if the VDD is shorted to GND. ash shown in the layout below
Also when I measied the resistance across C2 capacitor I see only 1.6ohm.
DId I get a faulty component?
Thanks.
A video of me doing the test is attached in the link.
Thanks.

20250508_115940000_iOS.MOV
1746706769208.png
 
GaN transistor are depletion mode type, low-ohmic drain source without negative gate bias. I don't know if the amplifier is healthy, but similar measurement results are expextable.
 
You must be very careful to sequence the bias voltages correctly, otherwise you will likely destroy it immediately. Read all documentation, twice.

There are two "gate" voltages you need to apply, Vg1 and Vg2. Vg1 is supposed to be -0.8V. Interestingly, Vg2 is positive, between +5-7V.
 
Maybe one trivial aspect:
The amplifier seems to be delivered as SMD component, who soldered that to the PCB? Something wrong with soldering?
 
Hello ,I have built a biasing sequencer for this circuit, the sequence is displayed in the scope photo below.
do you think this sequence will work properly for the amplifier ?
It wont get burnt when the following sequence will be connected to it?
Thanks.

1746903675271.png
1746899948780.png
 

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