Novel low-phase-shift numerical control attenuator

Abstract

The invention belongs to the technical field of wireless communication, and relates to an attenuator in a phased array system, in particular to a novel low-phase-shift numerical control attenuator which is used for solving the problem of large additional phase shift of an existing attenuator. According to the invention, the design of two stages of attenuation units is adopted, i.e., the attenuation unit is composed of a small attenuation unit 1 and a large attenuation unit 2; for the small attenuation unit, phase optimization is carried out by adopting a tail-connected capacitor (C1, C2) method; for the large attenuation unit, a phase compensation structure composed of phase adjustment capacitors (C3 and C4) and a phase translation compensation unit is used, so that the phase error between an attenuation state and a reference state can be remarkably reduced; through the combination of the two phase optimization means, the low-phase-shift numerical control attenuator can effectively improve the phase shift flatness of the attenuator, reduces the additional phase shift of the attenuator, can remarkably optimize the phase error of the attenuator, and expands the bandwidth.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, relates to an attenuator in a phased array system, and specifically provides a novel low-phase-shift numerical control attenuator. Background technique [0002] With the rapid development of wireless technology and the diversification of application scenarios, coupled with the huge improvement of the integrated circuit industry process, the small integration of transceiver modules has become a trend, and the research and development of high-performance transceiver chips has become a major issue in academia and industry. hotspots. To achieve fast beamforming and beam scanning, phased array systems are widely used at the receiver and transmitter in radar and communication systems. As a signal gain control circuit, the attenuator is widely used in the phased array system. The attenuator in the phased array system generally needs to meet the following basic requirements: First, it nee...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a new type of low phase shift numerically controlled attenuator for the problem of large additional phase shift in the above-mentioned existing attenuator; the present invention adopts two A digitally controlled attenuator with a new type of structure is composed of two different phase optimization methods, which can effectively improve the attenuator's phase shift flatness and reduce the attenuator's additional phase shift

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