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Design of a Low Voltage Class AB Variable Gain Amplifier (VGA)

A variable gain amplifier (VGA) is one of the most significant component in many applications such as analog to digital converter (ADC). In communication receiver, VGA is typically employed in a feedback loop to realize an automatic gain control (AGC), to provide constant signal power to baseband an...

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Main Authors: Idris, M. Idzdihar, Zainudin, M. N. A, Ismail , M. Muzafar, Abd. Rahim, Rosman
Format: Article
Language:English
Published: UTEM 2012
Subjects:
QA75 Electronic computers. Computer science
Online Access:http://eprints.utem.edu.my/id/eprint/12979/1/Design_of_a_Low_Voltage_Class_AB_Variable_Gain_Amplifier.pdf
http://eprints.utem.edu.my/id/eprint/12979/
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spelling my.utem.eprints.129792015-05-28T04:28:45Z http://eprints.utem.edu.my/id/eprint/12979/ Design of a Low Voltage Class AB Variable Gain Amplifier (VGA) Idris, M. Idzdihar Zainudin, M. N. A Ismail , M. Muzafar Abd. Rahim, Rosman QA75 Electronic computers. Computer science A variable gain amplifier (VGA) is one of the most significant component in many applications such as analog to digital converter (ADC). In communication receiver, VGA is typically employed in a feedback loop to realize an automatic gain control (AGC), to provide constant signal power to baseband analog-to-digital converter (ADC) for unpredictable received signal strengths. Gain range, power consumption and bandwidth of ADC are strongly influenced by the performance of operational amplifier. VGA is the key element for amplifying process in ADC. However, current class AB VGA is experiencing the limit of bandwidth, which is not suitable for high speed automatic gain control AGC. In order to overcome these limitations a high linearity and wide bandwidth of VGA is indispensable. The aim of this research is to get higher gain and larger bandwidth for VGA. In this research, a low cost, low power voltage and wide bandwidth class AB VGA is designed to mitigate this constraint. Superiority of the proposed VGA has been confirmed by circuit simulation using CEDEC 0.18-μm CMOS process with the help of tools from Mentor Graphics in designing a 100-MHz VGA under 1V supply voltage draining total static power consumption less than 125uW. The results show that the circuit is able to work with high linearity and wide bandwidth by varying Rf and Rs. Therefore, the frequency response (Gain) and the wide bandwidth of this class AB VGA is better than previously reported class AB VGA. Consequently, this modified class AB VGA is appropriate for high speed applications. UTEM 2012 Article PeerReviewed application/pdf en http://eprints.utem.edu.my/id/eprint/12979/1/Design_of_a_Low_Voltage_Class_AB_Variable_Gain_Amplifier.pdf Idris, M. Idzdihar and Zainudin, M. N. A and Ismail , M. Muzafar and Abd. Rahim, Rosman (2012) Design of a Low Voltage Class AB Variable Gain Amplifier (VGA). JTEC. pp. 1-7. ISSN 2180 - 1843
institution Universiti Teknikal Malaysia Melaka
building UTEM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknikal Malaysia Melaka
content_source UTEM Institutional Repository
url_provider http://eprints.utem.edu.my/
language English
topic QA75 Electronic computers. Computer science
spellingShingle QA75 Electronic computers. Computer science
Idris, M. Idzdihar
Zainudin, M. N. A
Ismail , M. Muzafar
Abd. Rahim, Rosman
Design of a Low Voltage Class AB Variable Gain Amplifier (VGA)
description A variable gain amplifier (VGA) is one of the most significant component in many applications such as analog to digital converter (ADC). In communication receiver, VGA is typically employed in a feedback loop to realize an automatic gain control (AGC), to provide constant signal power to baseband analog-to-digital converter (ADC) for unpredictable received signal strengths. Gain range, power consumption and bandwidth of ADC are strongly influenced by the performance of operational amplifier. VGA is the key element for amplifying process in ADC. However, current class AB VGA is experiencing the limit of bandwidth, which is not suitable for high speed automatic gain control AGC. In order to overcome these limitations a high linearity and wide bandwidth of VGA is indispensable. The aim of this research is to get higher gain and larger bandwidth for VGA. In this research, a low cost, low power voltage and wide bandwidth class AB VGA is designed to mitigate this constraint. Superiority of the proposed VGA has been confirmed by circuit simulation using CEDEC 0.18-μm CMOS process with the help of tools from Mentor Graphics in designing a 100-MHz VGA under 1V supply voltage draining total static power consumption less than 125uW. The results show that the circuit is able to work with high linearity and wide bandwidth by varying Rf and Rs. Therefore, the frequency response (Gain) and the wide bandwidth of this class AB VGA is better than previously reported class AB VGA. Consequently, this modified class AB VGA is appropriate for high speed applications.
format Article
author Idris, M. Idzdihar
Zainudin, M. N. A
Ismail , M. Muzafar
Abd. Rahim, Rosman
author_facet Idris, M. Idzdihar
Zainudin, M. N. A
Ismail , M. Muzafar
Abd. Rahim, Rosman
author_sort Idris, M. Idzdihar
title Design of a Low Voltage Class AB Variable Gain Amplifier (VGA)
title_short Design of a Low Voltage Class AB Variable Gain Amplifier (VGA)
title_full Design of a Low Voltage Class AB Variable Gain Amplifier (VGA)
title_fullStr Design of a Low Voltage Class AB Variable Gain Amplifier (VGA)
title_full_unstemmed Design of a Low Voltage Class AB Variable Gain Amplifier (VGA)
title_sort design of a low voltage class ab variable gain amplifier (vga)
publisher UTEM
publishDate 2012
url http://eprints.utem.edu.my/id/eprint/12979/1/Design_of_a_Low_Voltage_Class_AB_Variable_Gain_Amplifier.pdf
http://eprints.utem.edu.my/id/eprint/12979/
_version_ 1665905520910794752
score 13.211869

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