Ultra-wideband attenuator

Abstract

The invention discloses an ultra-wideband attenuator which comprises five attenuation units, namely a 0.5 dB attenuation unit, a 1 dB attenuation unit, a 2 dB attenuation unit, a 4 dB attenuation unitand a 8 dB attenuation unit, and can cover an amplitude adjustment range of 15.5 dB. The 0.5 dB attenuation unit and the 1dB attenuation unit are realized by a simplified T-shaped structure, the 2 dBattenuation unit and the 4dB attenuation unit are realized by an optimized T-shaped structure, and the 8dB attenuation unit is realized by an optimized n-shaped structure. Aiming at the problems thatthe existing structure is sensitive to load impedance, low in working frequency and large in amplitude modulation additional phase, the invention provides a capacitive compensation technology to reduce the amplitude modulation additional phase and improve the working frequency of the attenuators, provides an attenuation network optimization method for improving the impedance matching performanceof the attenuation units, provides an attenuation unit selection and arrangement strategy to reduce the overall loss of the attenuators and improve the amplitude modulation precision. Based on the above technology provided by the invention, a 5-bit switch type attenuator with high precision, low loss, low amplitude modulation additional phase and ultra wide band is finally realized.

Description

technical field [0001] The invention relates to an ultra-wideband attenuator technology, in particular to an ultra-wideband attenuator, which belongs to the technical field of electronic circuit design. Background technique [0002] In recent years, with the rapid development of communication technology, higher and wider spectrum resources will be used. Aiming at the problems of large propagation loss and small signal coverage in high-frequency bands, phased array technology, including multi-antenna array and beamforming technology, is widely used in high-frequency communication systems to compensate for path loss and improve the flexibility of signal coverage and directivity. [0003] The amplitude control module is an important part of the phased array system. Through the amplitude control, the signal amplitude of each channel of the phased array system can be adjusted to reduce the amplitude deviation between channels and reduce the side lobe of the synthesized beam of ...

AI Technical Summary

Problems solved by technology

Although the switch-type attenuator has the advantages of zero DC power consumption, small size, and low loss, the design of the switch-type attenuator still faces many challenges, such as (1) the attenuation unit is sensitive to the load impedance, which will reduce the accuracy of gain adjustment; (2) The operating frequency of the attenuator is limited by the parasitic capacitance of the transistor, which limits the application of the attenuator in the high-frequency band; (3) Affected by the parasitic capacitance of the transistor, the attenuator has phase errors in different attenuation states, which Will complicate the phase calibration of the phased array system

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