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Optimising Supply Voltage in GaN PA Design

GaN transistors have a higher power density and breakdown voltage than competing technologies, so can be operated over a greater range of supply voltage. Using as an example the design of a 1.5W 28 - 32GHz power amplifier, David Collins describes how the supply voltage can be used as a variable in the design and optimisation process, which allows the improvement of PA performance at power back-off (different power modes). It also means that the same part can be used for multiple applications, saving on design and development costs, and also that larger transistors can be utilised at a lower supply voltage to improve thermal performance. For further information please visit https://www.prfi.com.