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Related Experiment Videos

Noise and linearity optimization methods for a 1.9GHz low noise amplifier.

Wei Guo1, Da-Quan Huang

  • 1Department of Information and Electronic Engineering, Zhejiang University, Hangzhou 310027, China. alohagw@isee.zju.edu.cn

Journal of Zhejiang University. Science
|May 27, 2003
PubMed
Summary

This study analyzes noise and linearity in cascode Low Noise Amplifiers (LNAs). Findings show separate optimization of transistors is possible, improving both noise and linearity without trade-offs.

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Area of Science:

  • Electrical Engineering
  • Integrated Circuit Design

Background:

  • Radio Frequency Integrated Circuits (RFICs) demand high noise and linearity performance.
  • Low Noise Amplifiers (LNAs) are critical components in RFICs.
  • The cascode architecture is a prevalent design for LNAs.

Purpose of the Study:

  • To analyze noise and linearity in cascode LNA architectures.
  • To develop and validate techniques for improving noise and linearity in cascode structures.
  • To investigate the independent optimization of noise and linearity.

Main Methods:

  • Theoretical analysis of noise and linearity in cascode circuits.
  • Development of noise and linearity improvement techniques.
  • Computer simulations to validate theoretical findings and techniques.

Related Experiment Videos

  • Application of developed theory to a 1.9GHz CMOS LNA design.

    • Main Results:

    • The first Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) in a cascode LNA primarily influences noise performance.
    • The second MOSFET in a cascode LNA significantly impacts linearity.
    • Simulation results confirm theoretical predictions for noise and linearity contributions.
    • Demonstrated independent optimization of noise and linearity is achievable.

    Conclusions:

    • Cascode LNA noise and linearity can be optimized independently.
    • The first MOSFET controls noise, while the second controls linearity, allowing for separate design tuning.
    • This research enables enhanced LNA performance without compromising critical characteristics.