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Variable gain amplifier with wide dynamic adjustment range and low additional phase shift

A technology of gain amplifier and adjustment range, which is applied in the direction of improving the amplifier to reduce nonlinear distortion, gain control, and amplification control. The effect of simple structure

Active Publication Date: 2021-07-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, in the process of gain adjustment, ideally, the phase shift introduced by the VGA should be kept constant, otherwise it will increase the signal amplitude of the side lobe and reduce the scanning accuracy of the phased array.

Method used

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  • Variable gain amplifier with wide dynamic adjustment range and low additional phase shift
  • Variable gain amplifier with wide dynamic adjustment range and low additional phase shift
  • Variable gain amplifier with wide dynamic adjustment range and low additional phase shift

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Embodiment Construction

[0036] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0037] The wide dynamic adjustment range and low additional phase shift VGA of the present invention can be realized through the following steps:

[0038] The first step: According to the VGA gain and bandwidth requirements in the communication system, combined with the noise and linearity requirements, determine the VGA circuit structure; after simulation verification and debugging by simulation software, give VGA indicators such as component parameters and gain dynamic adjustment range, and determine different The additional phase shift corresponding to the gain range.

[0039] The second step: assign the gain adjustment range of the amplifier, the attenuation amount and the number...

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Abstract

The invention discloses a variable gain amplifier with a wide dynamic adjustment range and low additional phase shift. The variable gain amplifier comprises a first-stage feedback type variable gain unit, a second-stage feedback type variable gain unit, a first-stage switch attenuation module and a second-stage switch attenuation module; the input end of the first-stage switch attenuation module is connected to the output end of the first-stage feedback type variable gain unit, and the input end of the second-stage switch attenuation module is connected to the output end of the second-stage feedback type variable gain unit. The VGA can reasonably distribute the gain of the amplifier and the attenuation amount and attenuation digits of the switch attenuator according to the gain and additional phase shift requirements of the system, so that the VGA can be applied to various systems. According to the VGA, the position of the attenuator can be adjusted according to the requirements of a system for noise, linearity and input and output reflection coefficients, and the overall performance indexes of the VGA are balanced as required.

Description

technical field [0001] The invention relates to the technical field of variable gain amplifiers, in particular to a variable gain amplifier with wide dynamic adjustment range and low additional phase shift that can be used in phased array communication systems. Background technique [0002] The requirements for transmission rate of wireless communication equipment are increasing day by day, and there are problems such as lack of frequency resources and "traffic congestion" in wireless communication. The use of millimeter wave frequency bands to achieve ultra-high-speed point-to-point communication is an excellent solution, and research on 5G millimeter wave communication systems has also attracted widespread attention. [0003] In the 5G millimeter wave communication system, the highly integrated phased array has become a hot research field because of its advantages of high directivity, electronic beam control, strong anti-interference ability and high signal-to-noise ratio....

Claims

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Application Information

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IPC IPC(8): H03G3/20H03F1/32
CPCH03G3/20H03F1/32
Inventor 马凯学肖慧华傅海鹏陆敏
Owner TIANJIN UNIV
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