CMOS current-mode exponential/logarithmic function generator based on translinear loop configuration

Hacer A. Yildiz, Lida Kouhalvandi, Serdar Ozoguz

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

5 Citations (Scopus)

Abstract

In this paper, CMOS realizations of exponential function generators are considered and it is shown that the inherent square-law characteristic of the CMOS can be effectively used to produce the required exponential characteristic. While many of the existing exponential function generators rely on complicated coefficient settings procedure, in order approach, the circuit inherently realizes the required approximating function. However, the additional errors due to square-law model limitation can be alleviated by using so-called cascade realization technique. The functionality of the design is confirmed with 65 nm CMOS process technology with ± 0.5 V power supply in saturation region. In this design the power dissipation is 150 μ W. Simulation results proves the correctness of the theoretical analysis and proves the viability of the proposed structure.

Original languageEnglish
Title of host publication2019 42nd International Conference on Telecommunications and Signal Processing, TSP 2019
EditorsNorbert Herencsar
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages535-538
Number of pages4
ISBN (Electronic)9781728118642
DOIs
Publication statusPublished - Jul 2019
Event42nd International Conference on Telecommunications and Signal Processing, TSP 2019 - Budapest, Hungary
Duration: 1 Jul 20193 Jul 2019

Publication series

Name2019 42nd International Conference on Telecommunications and Signal Processing, TSP 2019

Conference

Conference42nd International Conference on Telecommunications and Signal Processing, TSP 2019
Country/TerritoryHungary
CityBudapest
Period1/07/193/07/19

Bibliographical note

Publisher Copyright:
© 2019 IEEE.

Funding

This work is supported by Istanbul Technical University the Scientific Research Projects Unit Under Grant No. MDK-2019-41968. There are variety purposes and applications of EXPFG generators such as variable gain amplifier (VGA) [7], [8] and automatic gain control [9], [10]. As a result of this interest, there is a notable amount of literature on CMOS EXPFGs. However, these approaches can be classified into two main groups: circuits with weak inversion and with strong inversion devices. In the former, the exponential-like characteristic of the MOSFET inherently favors the design of the EXPFGs but the circuits suffer from the well-known limitations of weak inversion operation, while in the latter, additional circuits should be used to design EXPFGs as a result of the incompatible square-law characteristic of the MOSFET [11]. Among these papers, This work is supported by Istanbul Technical University the Scientific Research Projects Unit Under Grant No. MDK-2019-41968.

FundersFunder number
Istanbul Technical University the Scientific Research Projects Unit
Firat University Scientific Research Projects Management UnitMDK-2019-41968

    Keywords

    • Approximation
    • CMOS current mode design
    • Error
    • Exponential function generator
    • Translinear loop

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