• HMC598 Internal Pull Down


    I work at General Dynamics and one of our modules was pulled while power was still applied, "Hot Swapped". We need be able to explain why nothing was damaged so the approach is to say how there is no direct discharge path to ground for the capacitors…

  • About HMC598 model number


    I want to use HMC589.
    There are two types of model numbers, and I'm not sure which one to use.

    Please tell me the difference between the following two points.
    (I also want to know if the performance is the same.)

    ・ HMC598
    ・ HMC598-SX

    Best Regards…

  • Biasing of HMC504LC4B and HMC598

    Good morning.

    I'm working in a new system design. I intend to use the HMC504LC4B amplifier and the HMC981LP3E active bias controller. The problem is that the gate control voltage of the bias controller defaults to -2,5V and the amplifier's gate bias voltage…

  • RE: HMC598 Die

    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

    Thank you,
  • The sequence of Vgg1 and Vgg2 of HMC598


    As we know, we need add Vgg firstly, but HMC598 has two Vgg: Vgg1 and Vgg2, so how we can adjust the voltage of Vgg1 and Vgg2 to get it works normal. Which Vgg can decide the current of Vdd?

  • RE: Any x2 or x4 multipliers for 46GHz output ? Use with a 46GHz Tunable Filter?

    The HMC598 & HMC579 are frequency doublers with outputs up to 46GHz (in addition to the HMC1105 which has output of 40-80GHz).  

  • hmc-alh382

    Hello. I'm a system designer.

    I'd like to use HMC-ALH382, HMC-ALH476, HMC598, HMC442 for making RF system.

    Above chips need two voltage supplies, VDD and  VGG.

    When I read "MMIC AMPLIFIER BIASING PROCEDURE", VGG shoud be on befor VDD is on.…

  • RE: HMC598_High current issue

    Hi Josh,

    Sorry to hear you're having problems with the HMC598. If bypassing is correct and you followed the bias sequencing (gate first, then drain, then adjust gate) perhaps they were damaged during installation. These are ESD HBM Class 0 sensitive…

  • PHEMT bias sequencing circuit


    I'm system engineer, so don't know well about PHEMT or HEMT chip.

    I'd like to use HMC598 and HMC-ALH382, HMC-ALH476 like doubler or AMP.

    These chips are required some bias sequence.

    You can find PDF file about bias

    //Design and…

  • RE: HMC920 default VGATE voltage

    Hi MuhammadAliGhafoor,

    Please refer to the AN-1363 app note in order to adjust VGATE and VNEG thresholds/voltages.