The datasheet states to adjust Vgg between -2.0 and -1.2V to achieve Idd1 + Idd2 = 98 mA, i want to adjust VGG with a voltage divider so i need to know the Vgg input current to compensate for the voltage drop across my divider.
I was unable to find any measured data on the gate current, it's very low though a few mA's at most. The bias needs to be turned on in a particular order, gate voltage first to pinch off the current, then the drain, then adjust the gate voltage until you achieve the specified Idd. Using a voltage divider will require large resistors as gate current is low. These resistors may add unwanted thermal noise, particularly at offsets well away from the carrier. A voltage divider alone doesn't address the sequencing problem and may allow overshoot which would also be a concern as exceeding -3Vdc on the gate will result in damage. I recommend you consider using one of our active bias controllers like the HMC920 as it can not only provide the negative gate voltage with its internal negative voltage generator but also the proper sequencing at power up to avoid damaging the device.
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