A single-to-differential low-noise amplifier with low differential output imbalance

This paper presents a single-ended input differential output low-noise amplifier intended for GPS applications. We propose a method to reduce the gain/amplitude and phase imbalance of a differential output exploiting the inductive coupling of a transformer or center-tapped differential inductor. A d...

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Bibliographic Details
Published inJournal of semiconductors Vol. 33; no. 3; pp. 35002 - 1-5
Main Authors Duan, Lian, Huang, Wei, Ma, Chengyan, He, Xiaofeng, Jin, Yuhua, Ye, Tianchun
Format Journal Article
LanguageEnglish
Published 01.03.2012
Subjects
Amplifiers
Consumption
Gain
Inductive coupling
Noise levels
Semiconductors
Transformers
Voltage gain
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Summary:This paper presents a single-ended input differential output low-noise amplifier intended for GPS applications. We propose a method to reduce the gain/amplitude and phase imbalance of a differential output exploiting the inductive coupling of a transformer or center-tapped differential inductor. A detailed analysis of the theory of imbalance reduction, as well as a discussion on the principle of choosing the dimensions of a transformer, are given. An LNA has been implemented using TSMC 0.18 mu m technology with ESD-protected. Measurement on board shows a voltage gain of 24.6 dB at 1.575 GHz and a noise figure of 3.2 dB. The gain imbalance is below 0.2 dB and phase imbalance is less than 2 degrees. The LNA consumes 5.2 mA from a 1.8 V supply.
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ISSN:1674-4926
DOI:10.1088/1674-4926/33/3/035002