On the Lower Bound to the Input and Output Mismatch of Conditionally Stable Linear Two-Ports

IF 6.9 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
Giovanni Ghione;Marco Pirola
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引用次数: 0

Abstract

In the design of amplifier stages based on unconditionally stable linear active two-ports, the amplifier gain can be maximized through simultaneous conjugate matching with passive loads at the input and output ports. Conversely, the optimization of linear amplifiers based on conditionally stable active devices requires a trade-off between gain, stability margin, input/output port mismatch and (for low-noise amplifiers) noise figure. Exploiting potentially in-band unstable devices can be advantageous in the design of open-loop low-noise amplifiers, since the in-band stabilization with input resistors is well known to negatively affect the amplifier minimum noise figure. Within this framework, the article derives a lower bound to the input and output mismatch of non unconditionally stable linear two-ports. The minumum mismatch is shown to only depend, in a simple way, on the stability factor $K$ and on the assumed mismatch ratio between the two ports. The minimum mismatch condition can be implemented by cascading the active, potentially in-band unstable two-port with two (input and output) reactive matching sections. The application of the theory to the design of low-noise amplifier open-loop stages based on conditionally stable active devices is discussed through CAD examples.
条件稳定线性双端口输入输出失配的下界
在基于无条件稳定线性有源双端口的放大器级设计中,通过在输入端和输出端同时与无源负载共轭匹配,可以使放大器增益最大化。相反,基于条件稳定有源器件的线性放大器的优化需要在增益、稳定裕度、输入/输出端口不匹配和(对于低噪声放大器)噪声系数之间进行权衡。利用潜在的带内不稳定器件在开环低噪声放大器的设计中是有利的,因为众所周知,输入电阻的带内稳定会对放大器的最小噪声系数产生负面影响。在此框架下,导出了非无条件稳定线性双端口输入输出不匹配的下界。以一种简单的方式显示,最小不匹配仅取决于稳定因子K和两个端口之间假定的不匹配比率。最小不匹配条件可以通过级联活动来实现,潜在的带内不稳定双端口具有两个(输入和输出)响应匹配部分。通过CAD实例讨论了该理论在条件稳定有源器件低噪声放大器开环级设计中的应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
10.70
自引率
0.00%
发文量
0
审稿时长
8 weeks
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