“…These bring convenience to the amplifier design and tune. The references used parallel offset lines to prevent power leakage at the low power period (when the peaking amplifier is cut-off) [3]- [7], but when if the additional transmission line is added to the output network of the carrier amplifier, the quarter 50 Ohm impedance will be changed longer, hence the carrier amplifier will see a complex impedance rather than a real 100 Ohm during the low power period, the changed output impedance may lead to a performance degradation. To avoid the impedance change, the offset line of the carrier amplifier is moved to the input stage in this paper, so the quarter 50 Ohm transformer remains unchanged.…”