Temperature insensitive current-mode CMOS exponential function generator and its application in variable gain amplifier

Karama M. Al-Tamimi; Munir A. Al-Absi; Muhammad Taher Abuelma'Atti

doi:10.1016/j.mejo.2013.12.010

Temperature insensitive current-mode CMOS exponential function generator and its application in variable gain amplifier

Karama M. Al-Tamimi^*, Munir A. Al-Absi, Muhammad Taher Abuelma'Atti

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

A new CMOS current-mode circuit to produce the exponential function, y=exp(x), is proposed. The proposed design has large input and output dynamic ranges while keeping very small linearity error. The functionality of the proposed design, confirmed using Tanner tool with 0.35 μm CMOS process technology indicates that it has superior performance compared to previously reported designs. A nearly 96 dB output dynamic range is obtained with the linearity error less than ±0.5 dB over an input range -5.75≤x≤5.75. The change in the output current due to temperature variation is ±1.27 dB over 100 C range. Application of the proposed exponential function generator in the design of an exponentially controlled variable gain amplifier is presented and its functionality is confirmed using simulation. 71 Linear-in-dB variable gain was achieved. The dB gain is controlled linearly by the control current, resulting in simple and low power structure.

Original language	English
Pages (from-to)	345-354
Number of pages	10
Journal	Microelectronics Journal
Volume	45
Issue number	3
DOIs	https://doi.org/10.1016/j.mejo.2013.12.010
State	Published - Mar 2014

Bibliographical note

Funding Information:
The authors would like to acknowledge the support of King Fahd University of Petroleum and Minerals (KFUPM), Dhahran, Saudi Arabia and the Hadhramout Establishment for Human Development, Hadhramout, Yemen .

Keywords

Approximation
CMOS
Current-mode
Exponential
Linear-in-dB
Translinear principle
VGA
Weak inversion

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Condensed Matter Physics
Surfaces, Coatings and Films
Electrical and Electronic Engineering

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10.1016/j.mejo.2013.12.010

Cite this

@article{e2d725f8a1ff4644befe87ea004d7ec7,

title = "Temperature insensitive current-mode CMOS exponential function generator and its application in variable gain amplifier",

abstract = "A new CMOS current-mode circuit to produce the exponential function, y=exp(x), is proposed. The proposed design has large input and output dynamic ranges while keeping very small linearity error. The functionality of the proposed design, confirmed using Tanner tool with 0.35 μm CMOS process technology indicates that it has superior performance compared to previously reported designs. A nearly 96 dB output dynamic range is obtained with the linearity error less than ±0.5 dB over an input range -5.75≤x≤5.75. The change in the output current due to temperature variation is ±1.27 dB over 100 C range. Application of the proposed exponential function generator in the design of an exponentially controlled variable gain amplifier is presented and its functionality is confirmed using simulation. 71 Linear-in-dB variable gain was achieved. The dB gain is controlled linearly by the control current, resulting in simple and low power structure.",

keywords = "Approximation, CMOS, Current-mode, Exponential, Linear-in-dB, Translinear principle, VGA, Weak inversion",

author = "Al-Tamimi, \{Karama M.\} and Al-Absi, \{Munir A.\} and Abuelma'Atti, \{Muhammad Taher\}",

note = "Funding Information: The authors would like to acknowledge the support of King Fahd University of Petroleum and Minerals (KFUPM), Dhahran, Saudi Arabia and the Hadhramout Establishment for Human Development, Hadhramout, Yemen .",

year = "2014",

month = mar,

doi = "10.1016/j.mejo.2013.12.010",

language = "English",

volume = "45",

pages = "345--354",

journal = "Microelectronics Journal",

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T1 - Temperature insensitive current-mode CMOS exponential function generator and its application in variable gain amplifier

AU - Al-Tamimi, Karama M.

AU - Al-Absi, Munir A.

AU - Abuelma'Atti, Muhammad Taher

N1 - Funding Information: The authors would like to acknowledge the support of King Fahd University of Petroleum and Minerals (KFUPM), Dhahran, Saudi Arabia and the Hadhramout Establishment for Human Development, Hadhramout, Yemen .

PY - 2014/3

Y1 - 2014/3

N2 - A new CMOS current-mode circuit to produce the exponential function, y=exp(x), is proposed. The proposed design has large input and output dynamic ranges while keeping very small linearity error. The functionality of the proposed design, confirmed using Tanner tool with 0.35 μm CMOS process technology indicates that it has superior performance compared to previously reported designs. A nearly 96 dB output dynamic range is obtained with the linearity error less than ±0.5 dB over an input range -5.75≤x≤5.75. The change in the output current due to temperature variation is ±1.27 dB over 100 C range. Application of the proposed exponential function generator in the design of an exponentially controlled variable gain amplifier is presented and its functionality is confirmed using simulation. 71 Linear-in-dB variable gain was achieved. The dB gain is controlled linearly by the control current, resulting in simple and low power structure.

AB - A new CMOS current-mode circuit to produce the exponential function, y=exp(x), is proposed. The proposed design has large input and output dynamic ranges while keeping very small linearity error. The functionality of the proposed design, confirmed using Tanner tool with 0.35 μm CMOS process technology indicates that it has superior performance compared to previously reported designs. A nearly 96 dB output dynamic range is obtained with the linearity error less than ±0.5 dB over an input range -5.75≤x≤5.75. The change in the output current due to temperature variation is ±1.27 dB over 100 C range. Application of the proposed exponential function generator in the design of an exponentially controlled variable gain amplifier is presented and its functionality is confirmed using simulation. 71 Linear-in-dB variable gain was achieved. The dB gain is controlled linearly by the control current, resulting in simple and low power structure.

KW - Approximation

KW - CMOS

KW - Current-mode

KW - Exponential

KW - Linear-in-dB

KW - Translinear principle

KW - VGA

KW - Weak inversion

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DO - 10.1016/j.mejo.2013.12.010

M3 - Article

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SN - 0026-2692

VL - 45

SP - 345

EP - 354

JO - Microelectronics Journal

JF - Microelectronics Journal

IS - 3

ER -

Temperature insensitive current-mode CMOS exponential function generator and its application in variable gain amplifier

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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