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We have been testing the HMC637ALP5E amplifier evaluation board, having set up the amplifier with the bias at the output we have observed that the amplifier is not drawing any current. Adjusting the negative voltage on Vgg1 between -3.0V and 0V had no effect, Vgg2 is set to 5.0V and Vdd is 12.0V.

Thanks and best regards