how to design the switch power supply for the RF amplifier!

dear all. as the topic, i want to use the GaAs device and the power supply is 27V,how to design the switch power dupply!

There is a range of linear or switching adjustable voltage regulators that can be used in power supplies ..
Everything depends on your power (current) requirements ..

Regards,
IanP

Be aware of the noise that the switch power supply will generate. Use a card entry filter behind the power supply to eliminate the noise.