The following is a list of classes of RF Power amplifier and associated efficiencies:

Class A: 25% to 50%,

Class B: 78.5%;

Class AB: 50% to 78.5%.

Class C: Up to 90%.

Class D: Over 90%,

Class E: Over 80% .

Class F: 100% (ideally).

Class G: Depends on input signal power . 60% to 80%.

Class H: 80%

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