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Large dynamic high-precision numerical control linear attenuator

A linear attenuator, high-precision technology, applied in the direction of digital technology network, impedance network, electrical components, etc., can solve the problems of low attenuation accuracy and large phase difference of variable attenuator, to reduce the number, improve the accuracy, reduce Insertion loss effect

Inactive Publication Date: 2015-03-11
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a digitally controlled step attenuator, aiming to solve the problem that the variable attenuator has a large phase difference in different attenuation states and low attenuation accuracy in a large dynamic range

Method used

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  • Large dynamic high-precision numerical control linear attenuator
  • Large dynamic high-precision numerical control linear attenuator
  • Large dynamic high-precision numerical control linear attenuator

Examples

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Embodiment 1

[0019] This embodiment describes a high-precision numerically controlled linear attenuator with 16 states, 5dB steps, and an attenuation range of 0-75dB. Refer to attached figure 2 , two-stage attenuation modules are connected in series, and each attenuation module has 4 parallel branches to form an attenuator with 16 states. The ADG904 is a single pole four throw electronic switch. TL1, TL2, TL3, TL4, TL5, TL6, TL7 and TL8 are microstrip transmission line phase-shift circuits, which compensate the phases of their branches respectively, so that the phase shifts of S1, S2, S3 and S4 branches are equal, and K1, K2, The phase shifts of the K3 and K4 branches are equal. The attenuation network is a π-type resistor network to achieve precise attenuation of the signal amplitude. Each resistor in the original π-type resistor network is composed of two precision resistors connected in parallel in the branch attenuation network, so that a high-precision attenuation network with any...

Embodiment 2

[0022] This embodiment describes a high-precision numerical control linear attenuator with 64 states, 1dB step, and an attenuation range of 0-63dB. Refer to attached image 3 , two-stage attenuation modules are connected in series, and each attenuation module has 8 parallel branches to form an attenuator with 64 states. HMC183QS24 is a single pole eight throw electronic switch. TL1, TL2, TL3, TL4, TL5, TL6, TL7, TL8, TL9, TL10, TL11, TL12, TL13, TL14, TL15, TL16 are microstrip transmission line phase shift circuits, which compensate the phase of the branch respectively, so that S1, The phase shifts of the S2, S3, S4, S5, S6, S7 and S8 branches are equal, and the phase shifts of the K1, K2, K3, K4, K5, K6, K7 and K8 branches are equal. The attenuation network is a π-type resistor network to achieve precise attenuation of the signal amplitude. Each resistor in the original π-type resistor network is composed of two precision resistors connected in parallel in the branch atten...

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Abstract

The invention relates to a large dynamic high-precision numerical control linear attenuator. The attenuator is realized on the basis of attenuating networks, phase shift circuits and electronic switches and adopts a topological structure combining parallel connection and series connection. The attenuator is formed through the series connection of two attenuating modules of identical structures, the attenuating modules consist of two electronic switches and a plurality of parallel attenuating branch circuits positioned between the two electronic switches, and the attenuating branch circuits are further formed through the series connection of the attenuating networks and the phase shift circuits. The phase shift of the attenuator is consist in all attenuating states, the phases of output signals of the attenuator are kept unvaried when the attenuator is converted among the attenuating states, and high precision is realized in a wide temperature range and a large dynamic range. The attenuator is particularly suitable for signal generators, radar signal simulators and phased array systems.

Description

technical field [0001] The invention relates to a numerically controlled attenuator, in particular to an attenuator with consistent phase shifts in each attenuation state, large dynamic range and high precision. Background technique [0002] Variable attenuators are widely used in radar signal simulators, signal generators, automatic gain controllers, phased array systems, electronic countermeasure systems and communication systems, etc., to control the signal amplitude. At present, variable attenuators have the disadvantages of large phase difference between each attenuation state and low attenuation accuracy when the dynamic attenuation range is large, which limits the application of variable attenuators in advanced systems, or increases the complexity of the application system. The attenuator with consistent phase shift of each attenuation state, precise attenuation in a large dynamic range, high consistency and temperature stability can save the application system from ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H17/00
Inventor 周资伟叶剑民李黎高凯邹建彬朱江王世练杨军卢树军张尔扬张炜赵苗
Owner NAT UNIV OF DEFENSE TECH
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