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Micro-electromechanical system (MEMS) stepping type digital attenuator

A digital attenuator, step-by-step technology, applied in impedance networks, electrical components, multi-terminal networks, etc., can solve the problems of poor switching linearity, large insertion loss, and complex control circuit design, and achieve good port impedance matching, Low power consumption, good for mass production

Active Publication Date: 2015-08-26
NO 55 INST CHINA ELECTRONIC SCI & TECHNOLOGYGROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are usually two ways to realize this kind of attenuator. One is a continuously adjustable electric attenuator, such as a PIN diode electric attenuator. Advanced digital attenuators are often realized by microwave electronic switches, but the linearity of the switches is poor and the insertion loss is large

Method used

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  • Micro-electromechanical system (MEMS) stepping type digital attenuator
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  • Micro-electromechanical system (MEMS) stepping type digital attenuator

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Embodiment Construction

[0030] The technical solution of the present invention will be further elaborated below in conjunction with the accompanying drawings.

[0031] The invention provides a stepping digital attenuator based on MEMS switch, the circuit topology is as follows figure 1 shown. The attenuator of the present invention includes a transmission line and n cascaded variable attenuation units, n≥1; variable attenuation unit A i including the resistor attenuation network N i , Upper MEMS switch K 1i and the lower MEMS switch K 2i , and the upper MEMS switch K 1i and the lower MEMS switch K 2i About Resistive Attenuation Network N i Up and down symmetrical, 1≤i≤n; when the MEMS switch K 1i Close and lower MEMS switch K 2i When disconnected, the variable attenuation element A i In the straight-through state; when the MEMS switch K 1i Disconnect and lower the MEMS switch K 2i When closed, the variable attenuation element A i in a decaying state. A specific embodiment of the present ...

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Abstract

The invention discloses a Micro-electromechanical system (MEMS) stepping type digital attenuator. The MEMS stepping type digital attenuator comprises a transmission line and n cascaded variable attenuation units, wherein n is greater than or equal to 1. The variable attenuation unit comprises a resistance attenuation network, an upper MEMS switch and a lower MEMS switch. The upper MEMS switch and the lower MEMS switch are in longitudinal symmetry relative to the resistance attenuation network. In the MEMS stepping type digital attenuator, the MEMS switch is adopted to replace a conventional electronic switch, the MEMS switches are symmetrical relative to the resistance attenuation network, so that a path which a signal pass through is the shortest, and the structure of the attenuator is more compact; access of different resistance attenuation networks is controlled through the MEMS switches, so that different attenuation is realized, the circuit topological structure is simple, the port impedance matching is good, the manufacture is simple, the technology compatibility is good, and mass production can be realized; in addition, an air bridge is introduced between two grounding metal faces of coplanar waveguide, so that the attenuation of the attenuator has better flatness in a broader frequency band.

Description

technical field [0001] The invention relates to a digital attenuator, in particular to a stepping digital attenuator using a MEMS switch. Background technique [0002] An attenuator, often referred to as a power attenuator, is an energy-loss RF / microwave component that contains resistive materials inside. It is widely used in the fields of radar, communication, instrumentation, etc., such as for controlling power levels, as a decoupling element between an oscillator and a load, and as a relative standard for comparing power levels, etc. At present, the research on attenuators is developing in the direction of small size, high bandwidth, adjustable gain, and low power consumption. [0003] Attenuators can be classified into lumped parameter attenuators and distributed parameter attenuators. Lumped parameter attenuators are divided into same-resistance lumped-parameter attenuators and different-resistance lumped-parameter attenuators, which can be divided into T-type same-re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H7/24
Inventor 孙俊峰姜理利朱健郁元卫贾世星焦宗磊姜国庆
Owner NO 55 INST CHINA ELECTRONIC SCI & TECHNOLOGYGROUP CO LTD
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