Wideband noise cancelling balun LNA with feedback biasing

Miguel D. Fernandes, Luis B. Oliveira, Joao Goes

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

In this paper we present a balun low noise amplifier (LNA) in which the noise figure (NF) and power consumption are reduced by using a feedback biasing structure. The circuit is based on a conventional wideband balun LNA with noise cancellation. We propose to replace the typical current source of the CG stage by a transistor that establishes a feedback loop in that stage. This adds a degree of freedom which can be used to vary the CG transistor's transconductance, making it different from the typical value of 20 mS. Thus. we can increase the ratio between the gm of the CG and CS stages, which reduces the LNA NF, area, and power consumption, when compared with conventional circuits. Simulation results, with 65 nm CMOS transistors at 1.2 V supply, show that the LNA bandwidth is 3.4 GHz, the voltage gain is 21.8 dB, and the NF is less than 2.5 dB, with IIP3 above -5 dBm. The power dissipation is 4.3 mW. Another design, concerning linearity, has 18.6 dB voltage gain, NF below 2.9 dB and IIP3 above +3 dBm, over a 5 GHz bandwidth, with power consumption of 8.5 mW.

Original languageEnglish
Title of host publication2016 IEEE International Symposium on Circuits and Systems (ISCAS 2016)
Place of PublicationNew York, USA
PublisherIEEE
Pages285-288
Number of pages4
ISBN (Electronic)978-147995340-0
ISBN (Print)978-1-4799-5342-4
DOIs
Publication statusPublished - 29 Jul 2016
Event2016 IEEE International Symposium on Circuits and Systems, ISCAS 2016 - Montreal, Canada
Duration: 22 May 201625 May 2016

Publication series

NameIEEE International Symposium on Circuits and Systems
PublisherIEEE
Volume2016-July
ISSN (Print)0271-4302

Conference

Conference2016 IEEE International Symposium on Circuits and Systems, ISCAS 2016
CountryCanada
CityMontreal
Period22/05/1625/05/16

Keywords

  • LOW-VOLTAGE APPLICATIONS

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