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2 - First Stage: Low-Noise Transconductance Amplifier

Published online by Cambridge University Press:  05 May 2022

Massoud Tohidian ,
Iman Madadi ,
Amir Bozorg  and
Robert Bogdan Staszewski
Massoud Tohidian
Affiliation:
Qualinx B.V., Delft
Iman Madadi
Affiliation:
Qualinx B.V., Delft
Amir Bozorg
Affiliation:
University College Dublin
Robert Bogdan Staszewski
Affiliation:
University College Dublin
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Summary

To be able to amplify an RF signal located at any of the supported cellular frequency bands, a wideband noise-canceling low-noiseamplifier (LNA) appears to be a good choice. As the receivers, later introduced in Chapter 5, are based on sampling the input charge, the RF amplifier needs to provide current rather than voltage, thus acting as a transconductance amplifier (TA) exhibiting a high output impedance compared to the input load of its subsequent stage. An LNTA (i.e., LNA+TA) could trivially be constructed by cascading LNA and TA (gm) stages. However, to improve noise and linearity, both of these circuits should be codesigned and tightly coupled. This chapter presents examples of state-of-the-art wideband noise-canceling LNTAs.

Keywords

current reuselow-noise amplifier (LNA)low-noise transconductance amplifier (LNTA)noise cancelationnoise reductionultra-wideband.
Type
Chapter
Information
Wireless Discrete-Time Receivers , pp. 23 - 54
Publisher: Cambridge University Press
Print publication year: 2022

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