Intermodulation signal generator of power amplifier and pre-distortion linearizer having the same

摘要

Provided are an intermodulation signal generator of a power amplifier and a pre-distortion linearizer having the same. The intermodulation signal generator of the power amplifier includes: a circulator for outputting a radio-frequency (RF) input signal input via a first port to a second port and outputting an intermodulation signal input via the second port to a third port; a directional coupler for shifting phases of the input signals input via the second port of the circulator to divide or couple the phase-shifted signals; first and second Schottky diodes, disposed symmetrically, for receiving the signals divided by the directional coupler to generate intermodulation signal components; first and second phase adjusters, disposed symmetrically, for controlling phases of the intermodulation signal components gene rated by the first and second Schottky diodes by means of first and second bias voltages; and first and second scalers, disposed symmetrically, for controlling magnitudes of the intermodulation signal components generated by the first and second Schottky diodes by means of third and fourth bias voltages. The above-described intermodulation signal generator can be applied to a power amplifier of a high-performance downscaled communication system.