A small-sized predistortion linearizer using diode mixer for improving intermodulation distortion of broadband power amplifier

摘要

According to a preferred embodiment of the predistortion linear broadband power amplifier according to the present invention, a predistorter having two carriers and a carrier transmission path therein consisting of a linear path and a nonlinear path and processed by the predistorter It is provided with an RF power amplifier for inputting the signal to remove the intermodulation signal generated by the RF power amplifier to amplify and output only the pure carrier.;The predistorter is a linearizer coupled to the front end of the RF power amplifier to linearize the RF power amplifier, and includes a first 90 ° hybrid coupler and a linear path for dividing the input two carriers into a linear path and a nonlinear path. A variable phase shifter that compensates for a phase difference occurring in a nonlinear path by inputting a carrier divided by the first 90 ° hybrid coupler, and an output signal of the variable phase shifter to compensate for a delay time that occurs in a nonlinear path Isolators for inputting carriers divided by the first 90 ° hybrid coupler in delay lines, mixers and nonlinear paths to generate intermodulation signals, and for preventing intermodulation signals generated in the mixers from being reinjected into the linear paths. ), Input the intermodulation signal generated by the mixer and the main signal It comprises a variable attenuator and a 2 90 ° hybrid coupler for coupling the non-linear path through the side signal path side linear signal and the variable attenuator via the delay line for adjusting the size of the modulation signal components.;The present invention is a wireless communication including IMT-2000 satellite communication base station, IMT-2000 repeater, PCS mobile communication base station, PCS repeater, GSM mobile communication base station, GSM repeater, terrestrial microwave radio system, mobile communication base station for cellular phone and repeater for cellular phone It can be used to increase the channel capacity of the system.