OUT-OF-PHASE POWER AMPLIFIER AND METHOD AND DEVICE FOR REALIZING OUTPUT MATCHING THEREFOR AND POWER AMPLIFIER BRANCH

摘要

An out-of-phase power amplifier and a method for realizing output matching therefor, comprising: calculating an offset angle of a combiner according to signal power back-off of a signal source, i.e., a signal peak-to-average ratio; determining, according to the calculated offset angle, a ratio of optimal impedance Zm1 corresponding to a peak output power of a power tube to optimal impedance Zm2 corresponding to a mean output power of the power tube, wherein the ratio is a standing-wave ratio; determining, according to the size of an isostatic standing-wave ratio circle, a maximum power point impedance Zopt of the power tube by means of a load pull mode; by taking the maximum power point impedance Zopt as a reference point, finding out a back-off high-efficiency point impedance Zbk_eff on the isostatic standing-wave ratio circle; and matching the maximum power point impedance Zopt and the back-off high-efficiency point impedance Zbk_eff, as corresponding impedance values, respectively to two input ends of the combiner.