Ultra wide band high-linearity active phase shifter

Abstract

The invention discloses an ultra wide band high-linearity active phase shifter. The ultra wide band high-linearity active phase shifter comprises a Lange coupler, ultra wide band amplifiers, a vector synthesis amplifier, an active Balun and a digital analog converter. The ultra wide band high-linearity active phase shifter is characterized in that a radio frequency signal is inputted into the Lange coupler, the Lange coupler generates an I-route signal and a Q-route signal, the wide band of the I-route signal and the wide band of the Q-route signal are orthogonal, the I-route signal and the Q-route signal are outputted into the I-route ultra wide band amplifier and the Q-route ultra wide band amplifier respectively, the I-route ultra wide band amplifier and the Q-route ultra wide band amplifier amplify the I-route signal outputted by the Lange coupler and the Q-route signal outputted by the Lange coupler respectively to generate four routes of orthogonal signals with the equal amplitude, and the four routes of orthogonal signals with the equal amplitude are outputted to the vector synthesis amplifier, the vector synthesis amplifier receives a phase and amplitude control signal outputted by the digital analog converter and a quadrant selection control signal outputted by the digital analog converter, conducts signal synthesis, phase selection and quadrant selection on the four routes of orthogonal signals which have the equal amplitude and are outputted by the I-route ultra wide band amplifier and the Q-route ultra wide band amplifier, and then outputs an I-route phase shifting signal and a Q-route phase shifting signal to the active Balun, and the active Balun conducts impedance matching on the phase shifting signals and outputs the phase shifting signals.

Description

technical field [0001] The invention relates to a phase shifter, in particular to an ultra-wideband high linearity active phase shifter. Background technique [0002] The phase shifter is a key component mainly used in electronic communication systems such as electronic countermeasure radar, digital mobile communication, microwave millimeter wave communication, etc. Its function is to shift the phase of the input signal by a certain value and then output it; Phase shifters are mainly divided into passive phase shifters and active phase shifters. Passive phase shifters have the advantages of high linearity and low power consumption, but passive phase shifters have a large area and cannot be integrated on a large scale. And it cannot be applied in broadband; active phase shifters have the advantages of high integration and broadband, and will be the mainstream direction of silicon-based phased array radar applications in the future. But the main problem of the traditional act...

AI Technical Summary

Problems solved by technology

This solution uses a quadrature phase-shifting network to generate four quadrature signals. In order to achieve high-precision quadrature phase-shifting in an ultra-wide broadband range, the input impedance of the quadrature phase-shifting network is low, but the front-end active balun cannot drive such Low impedance, especially at high frequencies, too low load impedance will cause the signal to be compressed in advance, so that high linear signal drive amplification cannot be achieved

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