A cmos broadband active phase shifter circuit

Abstract

A CMOS width active phase shifter circuit comprises two paths of biphase variable gain amplifiers which are connected with each other in parallel, a third stage multi-phase filter, an orthogonal synthesis circuit and a phase control circuit, wherein the two paths of biphase variable gain amplifiers serve as variable gain amplifiers of a subcircuit I and a subcircuit Q, output ends of the two paths of biphase variable gain amplifiers are connected with an IQ input end of the third stage multi-phase filter, an output end of the third stage multi-phase filter is connected with an input end of the orthogonal synthesis circuit, an output end of the phase control circuit is connected with the two paths of biphase variable gain amplifiers and the orthogonal synthesis circuit, the two paths of biphase variable gain amplifiers are each connected with an input end Sin_P and an input end Sin_N, and the orthogonal synthesis circuit is connected with an output end Sout_P and an output end Sout_N. The CMOS width active phase shifter circuit is low in noise coefficient, has a phase shifting range capable of covering 0-360 degrees, is wide in operating bandwidth, can achieve the operating bandwidth more than one frequency multiplication, is lower in production cost, and can be integrated into a ystem-on-a-chip implemented by adopting a standard CMOS technology more easily.

Description

Technical field: [0001] The invention relates to the technical field of active phase shifters realized based on CMOS technology, in particular to a CMOS broadband active phase shifter circuit suitable for radio system radio frequency front-end circuits represented by phased arrays. Background technique: [0002] The phase shifter is the main component to control and change the phase of electromagnetic waves. It is widely used in radar detection, wireless communication, satellite telemetry and other fields. In the Phased Array system with Electronic Bean-steering as the core, Phase-shifting accuracy directly affects performance such as beam scanning accuracy, and restricts system cost to a large extent. Most traditional phase shifter designs are implemented in passive ways, such as using switch-controlled transmission lines, based on high- and low-pass filters or based on reflective loads. Passive phase shifters have high phase shifting accuracy and low power consumption, bu...

AI Technical Summary

Problems solved by technology

[0010] 1. The all-pass filter or passive bridge is generally located in the first stage of the circuit, and its large loss makes the overall noise figure of the phase shifter large;

[0011] 2. The relative bandwidth of the all-pass filter or passive bridge is generally 25% to 40%, so it is difficult to realize the design of a phase shifter above an octave;

[0012] 3. The circuit generally contains passive components such as inductors, which makes the area of ​​the phase shifter larger

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