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LOW drain current (AUH320, ALH509, HMC1144)

Question asked by jaber on Feb 27, 2017
Latest reply on Mar 14, 2017 by Mark_D

Hi,

I am a student and I designed a 77 GHz TRx in which I used ALH509 as LNA and AUH320 as PA. The problem is in biasing and I can't reach the maximum currents as it is mentioned in Datasheets, i.e., 70mA instead of 130mA in AUH320 or 15mA instead of 50mA in ALH509!! I also measured the voltages at the traces very close to the chips and the voltage drop is only around 10mV from the assigned voltage at the power supply. I have the same problem with HMC1144 that I used as PA within the LO path. The current valu that I see is 90mA instead of 320mA.

I don't understand why I can't see more current even with the gate voltage of 0 V!! I'd be very grateful if you could help me with this issue.

Thanks in advance,

Jaber

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