A One-Step Input Matching Method for Cascode CMOS Low-Noise Amplifiers(Electronic Circuits)

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概要

• 論文の詳細を見る

• In the design of cascode CMOS low-noise amplifiers, the gate-drain capacitance is generally neglected because it is thought to be small enough compared to gate-source capacitance. However, a careful examination will reveal the fact that the drain impedance of the input transistor significantly affects the input impedance through the gate-drain capacitance, especially as the CMOS technology getting more and more advanced. Moreover, the substrate coupling network of the input transistor also comes into play when the drain impedance of the input transistor is high enough compared to the substrate coupling network. In order to make input matching easier, it is desirable to know the details of the substrate coupling network. Unfortunately, designers generally do not have enough information about the technology they have used, not to mention knowing the details concerning the substrate coupling network. As a matter of fact, designers generally do have foundry provided component models that contain information about the substrate coupling network. This gives us the chance to minimize its effect and predict the input impedance of a low noise amplifier more accurately. In this paper, we show that the effect of the substrate coupling network can be ignored by keeping the drain impedance of the input transistor low enough and a proper drain impedance can then be chosen to achieve input matching without the need of iteration steps. Simulation results of a 2.4 GHz CMOS low noise amplifier using foundry provided component models are also presented to demonstrate the validation of the proposed input matching method.

• 社団法人電子情報通信学会の論文
• 2005-03-01

著者

• Shu Ying

  Department Of Electrical Engineering National Taiwan University

• Feng Wu

  Department Of Electronic Engineering Chang Gung University

• Feng Wu

  Department Of Electrical Engineering Chang Gung University

• SUN Ming

  Department of Electrical Engineering, National Taiwan University

• TENQCHEN Shing

  NTU-EE, also with Chunghwa Telecom Telecommunication Labs.

• Sun Ming

  Department Of Electrical Engineering National Taiwan University

• Tenqchen Shing

  Ntu-ee Also With Chunghwa Telecom Telecommunication Labs.

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