Combined X-band five-bit phase shifter based on active and inactive structures

Abstract

The invention discloses a combined X-band five-bit phase shifter based on active and inactive structures, and mainly solves the problems of large gain error and low phase shift precision in the priorart. The phase shifter comprises filters (1), an active balun (3) and switches (4); multiple filters and switches are respectively provided and are alternately connected; the last switch is connectedwith an input end of the active balun; an output end of the active balun is connected with an orthogonal signal generator (2) and is used for generating positive and negative in-phase signals and positive and negative orthogonal signals; and an output end of the orthogonal signal generator is connected with a one-in-four circuit (5), and is used for selecting one path of signals from four paths ofsignals, namely the positive and negative in-phase signals and the positive and negative orthogonal signals to output, thereby implementing transformation of the signals among four quadrants. The phase shifter has the advantages of small gain error and high phase shift precision, and can be used in a radio-frequency integrated circuit in which a high-precision phase shifter is needed by a radio-frequency microwave phased array receiver.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to an X-band 5-phase shifter, which can be used in radio frequency integrated circuits requiring high-precision phase shifters such as radio frequency microwave phased array receivers. Background technique [0002] Phase shifters are widely used in radar, missile attitude control, accelerator, communication, instrumentation and even music. The main performance indicators of the phase shifter are: 1) working frequency band; 2) phase shift phasor; 3) phase shift accuracy; 4) insertion loss; 5) input standing wave ratio; 6) withstand power. Traditional digital passive phase shifters are mainly divided into switch linear phase shifters, load linear phase shifters, high and low pass phase shifters and reflective phase shifters, which are all based on discrete components. The main disadvantages are: 1) The circuit topology is complex; 2) The design is difficult; 3...

AI Technical Summary

Problems solved by technology

Traditional digital passive phase shifters are mainly divided into switch linear phase shifters, load linear phase shifters, high and low pass phase shifters and reflective phase shifters, which are all based on discrete components. The main disadvantages are: 1) The circuit topology is complex; 2) The design is difficult; 3) The process is difficult; 4) The phase shift accuracy is low; 5) The integration is low

The circuit achieves phase shift through filters. Although it has the advantages of simple design ideas and high linearity, as the number of filters increases, the difficulty of phase shift control increases, and the gain will be further attenuated, so that the final output appears The disadvantages of low phase shift accuracy and large gain error

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