Recommended Active Bias Controller for HMC1121

Is there a recommended active bias controller similar to the HMC980 available for the HMC1121 that can handle the 2200mA drain current?

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    •  Analog Employees 
    on Jun 6, 2018 7:41 PM

    1) Are both the HMC980 gates tied together?

        I believe only the top HMC980 gate is connected to the amplifier. The gate of the bottom HMC980 is left open.

    2) Is a series resistor required on the gate voltage for stability?

        2.2uF bypass capacitor is sufficient for stability.

    3) Since the Vgate cannot go below -2V how should the gate voltage limiting resistors be installed per AN-1363?

       In AN-1363, please refer to "ADJUSTING THE DEFAULT VNEG AND VGATE THRESHOLD VALUES" for    adjusting default gate voltage threshold. VGate and VNEG limiting are done through adding resistors R5, R6, R7    and R8 shown in figure 15.

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  • 0
    •  Analog Employees 
    on Jun 6, 2018 7:41 PM

    1) Are both the HMC980 gates tied together?

        I believe only the top HMC980 gate is connected to the amplifier. The gate of the bottom HMC980 is left open.

    2) Is a series resistor required on the gate voltage for stability?

        2.2uF bypass capacitor is sufficient for stability.

    3) Since the Vgate cannot go below -2V how should the gate voltage limiting resistors be installed per AN-1363?

       In AN-1363, please refer to "ADJUSTING THE DEFAULT VNEG AND VGATE THRESHOLD VALUES" for    adjusting default gate voltage threshold. VGate and VNEG limiting are done through adding resistors R5, R6, R7    and R8 shown in figure 15.

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