volume | PIER Journals

2014-08-20

A Distinctive Method of Eliminating Out-Band Instability in Cascaded Active Device System Based on Narrow-Band Attenuation

Xiaowei Zhu,

Dr. Xiaowei Zhu

Department of Electronic Engineering

Shanghai Jiao Tong University

China

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Jun-Ping Geng,

Dr. Jun-Ping Geng

Dept. of Electronic Engineering

Shanghai Jiao Tong University

China

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Xianling Liang,

Dr. Xianling Liang

Department of Electronic Engineering

Shanghai Jiao Tong University

China

Homepage

Rong-Hong Jin,

Dr. Rong-Hong Jin

Dept. of electronic Engineering

Shanghai Jiao Tong University

China

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Yangzhen Huang

Dr. Yangzhen Huang

Department of Electronic Engineering

Shanghai Jiao Tong University

China

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Progress In Electromagnetics Research Letters, Vol. 48, 59-65, 2014

doi:10.2528/PIERL14062504 | Google Scholar

Abstract

A distinctive connection method in cascaded RF/MW active device system achieving both stability and low gain loss is presented. Unlike traditional methods (isolator and attenuator), the proposed solution introduces an appropriate length of transmission line to change the input impedance at the out-band instable frequency point and uses a narrow-band termination to absorb the instable power without deteriorating in-band signal. Moreover, the reason that instability often occurs in the cascaded system is analysed with S-parameters， and it turns out to be a kind of out-band instability. And then the solution is verified by an adjustable circuit example whose insertion loss is below 0.3 dB.

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Xiaowei Zhu, Jun-Ping Geng, Xianling Liang, Rong-Hong Jin, and Yangzhen Huang, "A Distinctive Method of Eliminating Out-Band Instability in Cascaded Active Device System Based on Narrow-Band Attenuation," Progress In Electromagnetics Research Letters, Vol. 48, 59-65, 2014.
doi:10.2528/PIERL14062504

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