• RE: Can HMC981 control HMC997?

    You are correct. When configuring an active bias controller, you need to set the target fixed drain current to the maximum expected value when RF is present.  If you want to get the specified output power and OP1dB, I think that IDQ needs to be set to…

  • HMC997 bias with HMC920

    Dear Sirs,

    I am currently designing K band VGA with HMC997. Is it possible to use the active bias controller HMC920? I do not see HMC997 in the list of the bias controller possible amplifiers.

    Best Regards,


  • HMC997 and HMC565 Demo-board Capacitors


    I am experiencing some differences between my PCB's (replicas of the demo boards) using these integrated circuits and the demo board that I ordered from Hittite. As these differences are the same and occur on the same bands (approx 17 GHz) in…

  • Can HMC565 and HMC997 have their supplies switched dynamically to switch transmission and reception paths?


    We have a loop made of these two amplifiers. However, they are on diferent paths isolated with RF swtiches. These switches are not sufficient to grant isolation though. For this reason an oscillation occurs at around 22 GHz. To compensate this, we…

  • RE: HMC997LC4 & HMC943APM5E RF output issue

    Hi Kalhana,

    Can you share your set up for this measurement? What is the input power level to the HMC997LC4? Are you using ADI eval boards or a board of your own design? Can you measure the small signal gain of the HMC997 and confirm the gain is ~ 6-7…

  • HMC499 HMC1131 or other Analog Controlled VGA's


    I am thinking of using a medium power amplifier to increase my Tx power in a K-band system, however currently I don't have a negative voltage circuitry in my design. What would you recommend for that purpose?

    My question is for Hmc499 or Hmc1131…