AnsweredAssumed Answered

HMC981LP3E

Question asked by gkrf on Sep 4, 2015
Latest reply on Sep 10, 2015 by kkaya

Hi, I'm considering using the HMC981 for controlling bias on the HMC996 VGA. I have a few questions:

 

1) Is this part compatible with the HMC996?

 

2) If the HMC981 controls two gate voltages, how come there is only one drain voltage input for current monitoring?

    Isn't that doing bias control based on feedback from combined amplifier stage currents? I need to ensure that each

    stage of amplification is getting the constant Idsq bias.

 

3) If used with HMC996, which Vgg pins get connected to Vgate, VG2 on HMC981 controller?

    I assume Vgg1 to Vgate and Vgg2 to VG2, but it is not completely clear to me from the datasheet.

 

Thanks for resolving this confusion.

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