sentence: Class - E power amplifier PAs work as a switch and can obtain , theoretically , 100% power efficiency . The Class - E power amplifier ( PA ) was introduced by Sokal in 1975 .
modified: Class - E power amplifier PAs work as a switch and can obtain theoretically 100% power efficiency . Class - E power amplifier ( PA ) was introduced by Sokal in 1975 .
transformation: PUNCT, PUNCT, DET