Is there a recommended active bias controller similar to the HMC980 available for the HMC1121 that can handle the 2200mA drain current?
We do not have bias controller that go above 1.6A. However you can use 2x HMC980 to increase the supply current. Below is an example using 2xHMC980 to generate 2.4A.
Connections between the 2x HMC980:
Thanks for the suggestion. I have a couple additional questions.
1) Are both the HMC980 gates tied together?
2) Is a series resistor required on the gate voltage for stability?
3) Since the Vgate cannot go below -2V how should the gate voltage limiting resistors be installed per AN-1363?
I believe only the top HMC980 gate is connected to the amplifier. The gate of the bottom HMC980 is left open.
2.2uF bypass capacitor is sufficient for stability.
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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