Analysis of a low noise amplifier with LC-ladder matching and capacitive shunt-shunt feedback

Marnus Weststrate; Saurabh Sinha

doi:10.1109/AFRCON.2009.5308169

Analysis of a low noise amplifier with LC-ladder matching and capacitive shunt-shunt feedback

Marnus Weststrate, Saurabh Sinha

University of Pretoria

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

8 Citations (Scopus)

Abstract

In this paper a new low noise amplifier configuration is proposed to achieve wideband operation. This configuration consists of an LC-ladder filter and a common-emitter stage employing shunt-shunt capacitive feedback to realize wideband matching. Design equations for this configuration are derived, as well as equations for the important performance measures namely noise figure, gain and IIP3. The results of a design for achieving typical low noise amplifier specifications in the ultra-wideband are calculated from these equations and plotted. Without any optimization S₁₁ of less than -10 dB over the entire frequency band and a minimum noise figure of 2.87 dB are predicted when achieving S₂₁ of 20 dB. These results indicate that very good performance can be attained through the use of this technique.

Original language	English
Title of host publication	IEEE Africon 2009
DOIs	https://doi.org/10.1109/AFRCON.2009.5308169
Publication status	Published - 2009
Externally published	Yes
Event	IEEE Africon 2009 - Nairobi, Kenya Duration: 23 Sept 2009 → 25 Sept 2009

Publication series

Name	IEEE AFRICON Conference

Conference

Conference	IEEE Africon 2009
Country/Territory	Kenya
City	Nairobi
Period	23/09/09 → 25/09/09

Keywords

Capacitive feedback
Input matching
LC-ladder filter
Low noise amplifier
Ultra-wideband

ASJC Scopus subject areas

Computer Science Applications
Electrical and Electronic Engineering

Access to Document

10.1109/AFRCON.2009.5308169

Cite this

@inproceedings{1dc7ed8121c54637be990e30af82de50,

title = "Analysis of a low noise amplifier with LC-ladder matching and capacitive shunt-shunt feedback",

abstract = "In this paper a new low noise amplifier configuration is proposed to achieve wideband operation. This configuration consists of an LC-ladder filter and a common-emitter stage employing shunt-shunt capacitive feedback to realize wideband matching. Design equations for this configuration are derived, as well as equations for the important performance measures namely noise figure, gain and IIP3. The results of a design for achieving typical low noise amplifier specifications in the ultra-wideband are calculated from these equations and plotted. Without any optimization S11 of less than -10 dB over the entire frequency band and a minimum noise figure of 2.87 dB are predicted when achieving S21 of 20 dB. These results indicate that very good performance can be attained through the use of this technique.",

keywords = "Capacitive feedback, Input matching, LC-ladder filter, Low noise amplifier, Ultra-wideband",

author = "Marnus Weststrate and Saurabh Sinha",

year = "2009",

doi = "10.1109/AFRCON.2009.5308169",

language = "English",

isbn = "9781424439195",

series = "IEEE AFRICON Conference",

booktitle = "IEEE Africon 2009",

note = "IEEE Africon 2009 ; Conference date: 23-09-2009 Through 25-09-2009",

}

TY - GEN

T1 - Analysis of a low noise amplifier with LC-ladder matching and capacitive shunt-shunt feedback

AU - Weststrate, Marnus

AU - Sinha, Saurabh

PY - 2009

Y1 - 2009

N2 - In this paper a new low noise amplifier configuration is proposed to achieve wideband operation. This configuration consists of an LC-ladder filter and a common-emitter stage employing shunt-shunt capacitive feedback to realize wideband matching. Design equations for this configuration are derived, as well as equations for the important performance measures namely noise figure, gain and IIP3. The results of a design for achieving typical low noise amplifier specifications in the ultra-wideband are calculated from these equations and plotted. Without any optimization S11 of less than -10 dB over the entire frequency band and a minimum noise figure of 2.87 dB are predicted when achieving S21 of 20 dB. These results indicate that very good performance can be attained through the use of this technique.

AB - In this paper a new low noise amplifier configuration is proposed to achieve wideband operation. This configuration consists of an LC-ladder filter and a common-emitter stage employing shunt-shunt capacitive feedback to realize wideband matching. Design equations for this configuration are derived, as well as equations for the important performance measures namely noise figure, gain and IIP3. The results of a design for achieving typical low noise amplifier specifications in the ultra-wideband are calculated from these equations and plotted. Without any optimization S11 of less than -10 dB over the entire frequency band and a minimum noise figure of 2.87 dB are predicted when achieving S21 of 20 dB. These results indicate that very good performance can be attained through the use of this technique.

KW - Capacitive feedback

KW - Input matching

KW - LC-ladder filter

KW - Low noise amplifier

KW - Ultra-wideband

UR - http://www.scopus.com/inward/record.url?scp=74349128371&partnerID=8YFLogxK

U2 - 10.1109/AFRCON.2009.5308169

DO - 10.1109/AFRCON.2009.5308169

M3 - Conference contribution

AN - SCOPUS:74349128371

SN - 9781424439195

T3 - IEEE AFRICON Conference

BT - IEEE Africon 2009

T2 - IEEE Africon 2009

Y2 - 23 September 2009 through 25 September 2009

ER -

Analysis of a low noise amplifier with LC-ladder matching and capacitive shunt-shunt feedback

Abstract

Publication series

Conference

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this