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A radio frequency power amplifier (RFPA) is an electronic device designed to provide greater radio frequency (RF) power from its signal output port than the RF power supplied to its signal input port. RFPA's are used in many applications including cellular telephone systems, computer network systems, radio and television broadcasting, aviation, medical imaging and industrial applications. RFPAs use transistors or vacuum tubes to convert electrical energy most often providedsupplied from a direct current voltage source into RF electrical energy. The first RFPAs were made in 19nn, for radio transmitters. In the 21st century most RFPAs utilize [[transistors]], but certain amplifier designs utilize [[vacuum tubes]]. An RFPA can be designed to be a linear amplifier, a non-linear amplifier, or provision can be made to allow operation as either.