Can VGG be tied to ground for biasing an MMIC amplifier, and what are the consequences if it is not possible to provide a negative gate voltage?

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Accepted Answer

If VGG is tied to ground, the amplifier will not function correctly. Setting VGG to -2 V will put the amplifier in pinch-off mode, where no drain current flows and the amplifier is essentially turned off. Increasing VGG to a more positive value will decrease the drain to source resistance and increase the drain current. However, VGG cannot be set to 0 V as this will reduce the drain-to-source resistance to almost 0 V, causing the applied drain voltage to burn out the transistor. If a negative gate voltage cannot be provided, consider using a single positive supply voltage amplifier such as the ADL8100 or HMC8413.

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HMC634LC4 : FAQ