CN112583385B

CN112583385B - Variable gain broadband phase shifter

Info

Publication number: CN112583385B
Application number: CN201910929450.1A
Authority: CN
Inventors: 刘兵; 马凯学; 孟凡易; 傅海鹏
Original assignee: Tianjin University
Current assignee: Tianjin University
Priority date: 2019-09-27
Filing date: 2019-09-27
Publication date: 2024-03-01
Anticipated expiration: 2039-09-27
Also published as: CN112583385A

Abstract

The invention discloses a variable gain broadband phase shifter, which comprises a 5-bit phase control unit and a 4-bit gain control unit, wherein the phase control unit is used for realizing accurate phase control with the step of 11.25 degrees, and the gain control unit is used for realizing gain control with the step of 0.5 dB. The invention has the beneficial effects of (1) multifunction. One module circuit can realize two functions of phase control and gain control; and (2) the phase shifting precision is high, and the working frequency range is wide. The gain control unit improves the isolation between the phase shifting units, so that the influence between the phase shifting units is smaller, and better phase control can be realized in a broadband, namely, the phase shifting precision is improved.

Description

Variable gain broadband phase shifter

Technical Field

The invention relates to the field of microwave and millimeter wave terahertz integrated circuits, in particular to a variable gain broadband phase shifter.

Background

The millimeter wave phased array technology has various advantages of large-scale array integration, rapid, flexible and controllable beam scanning, accurate spatial resolution and the like, and is widely applied to the field of military radars and the field of vehicle radars in intelligent driving, namely 5G and 6G communication fields. The amplitude and phase control module is used as a most critical circuit in the phased array technology, and the performance of the amplitude and phase control module determines performance indexes such as beam scanning precision, beam scanning range and the like of a phased array system. In the amplitude-phase control module, the phase shifter provides accurate phase control for the phased array system; the attenuator or gain controller obtains better beam width and sidelobe level for compensating gain error caused by phase change of the phase shifter and adjusting signal amplitude.

In a conventional phased array amplitude-phase control module, the phase shifter and the attenuator are two independent module circuits, and generally occupy a large chip area. Each phase shifting unit in the traditional numerical control phase shifter is directly connected, mutual interference among the phase shifting units is large, design and optimization difficulties are high, and high phase shifting precision is difficult to realize in a wide frequency range. Moreover, at millimeter wave frequencies, the loss of passive devices is large, and passive phase shifters and attenuators can put very high demands on the gain of amplifiers in phased array systems, and can also increase the static power consumption of the system.

Disclosure of Invention

Based on the above requirements, in order to overcome the defects of the conventional digital control phase shifter structure, a variable gain broadband phase shifter is provided, and two functions of phase control and gain control are realized by using one circuit, and meanwhile, the phase shifting precision is improved in a broadband frequency range.

To achieve the object of the present invention, the present invention provides a variable gain broadband phase shifter, comprising a 5-bit phase control unit for implementing accurate phase control stepped by 11.25 ° and a 4-bit gain control unit for implementing gain control stepped by 0.5 dB.

The phase control unit and the gain control unit adopt digital control circuit structures.

The phase control units and the gain control units are distributed transversely in a structure with empty insertion intervals, and different phase control units are isolated by the gain control units, so that the phase shift quantity and the amplitude balance degree of the phase control units are hardly influenced by other phase shift units, and the phase shift precision of the phase shifter is improved.

Compared with the prior art, the invention has the beneficial effects that,

(1) Multifunctional. One module circuit can realize two functions of phase control and gain control;

(2) High phase-shifting precision and wide working frequency range. The gain control unit improves the isolation between the phase shifting units, so that the influence between the phase shifting units is smaller, and better phase control can be realized in a broadband, namely, the phase shifting precision is improved.

Drawings

Fig. 1 is a schematic diagram of a variable gain wideband phase shifter structure of the present application.

Fig. 2 is a schematic diagram of a variable gain wideband phase shifter embodiment of the present application.

Detailed Description

The invention is described in further detail below with reference to the drawings and the specific examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the singular is "a," an, "and/or" the "include" when used in this specification is taken to mean that there are features, steps, operations, components or modules, assemblies, and/or combinations thereof.

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.

As shown in fig. 1, the present invention provides a variable gain broadband phase shifter including a 5-bit phase control unit and a 4-bit gain control unit. The phase control unit is used for realizing accurate phase control with the step of 11.25 degrees, and the gain control unit is used for realizing gain control with the step of 0.5 dB.

The arrangement sequence of the phase control unit and the gain control unit has a certain influence on the performance of the circuit. In the present embodiment as shown in fig. 2, the input signal is sequentially connected to a 180 ° phase shift unit and a 90 ° phase shift unit, and then sequentially connected to a 4dB gain control unit, a 22.5 ° phase shift unit, a 2dB gain control unit, a 11.25 ° phase shift unit, a 1dB gain control unit, a 45 ° phase shift unit, and a 0.5dB gain control unit.

The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.

Claims

1. A variable gain broadband phase shifter, comprising a 5-bit phase control unit and a 4-bit gain control unit, wherein the phase control unit is used for realizing accurate phase control with a step of 11.25 DEG, and the gain control unit is used for realizing gain control with a step of 0.5 dB; the phase control unit and the gain control unit adopt digitally controlled circuit structures; the phase control units and the gain control units are transversely distributed in a structure with empty insertion intervals, and different phase control units are isolated by the gain control units, so that the phase shift quantity and the amplitude balance degree of the phase control units are hardly influenced by other phase shift units, and the phase shift precision of the phase shifter is improved; the phase control unit and the gain control unit are implemented by one module circuit.