A simple LDO with adaptable bias for internet of things applications

I. M. Filanovsky, L. B. Oliveira, N. T. Tchamov, V. V. Ivanov

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

1 Citation (Scopus)

Abstract

A new transistor model is used for design of two LDO regulators using a differential stage loaded by a current amplifier and the voltage feedback. The first LDO has a constant bias current, the second LDO has an additional adaptable bias circuit controlled by the load current. The LDOs are analyzed and compared. When the load is absent, the transistors in both circuits are operating in weak inversion; when the load is increasing the pass transistors in both circuits are moving to strong inversion. It is shown that in these LDOs the output voltage may be higher than the input reference voltage at very small load currents, and the circuits start "to follow" the input voltage only being loaded with a load current depending on the bias and LDO loop gain. The circuits were designed for 130 nm CMOS technology and their operation was verified using CADENCE simulation tool.

Original languageEnglish
Title of host publicationIEEE International Symposium on Circuits and Systems
Subtitle of host publicationFrom Dreams to Innovation, ISCAS 2017 - Conference Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781467368520
DOIs
Publication statusPublished - 2017
Event50th IEEE International Symposium on Circuits and Systems, ISCAS 2017 - Baltimore, United States
Duration: 28 May 201731 May 2017

Conference

Conference50th IEEE International Symposium on Circuits and Systems, ISCAS 2017
CountryUnited States
CityBaltimore
Period28/05/1731/05/17

Fingerprint

Networks (circuits)
Transistors
Electric potential
Bias currents
Internet of things
Feedback

Keywords

  • Adaptable bias
  • LDO
  • Moderate inversion
  • Strong Inversion
  • Translinear loop
  • Weak inversion

Cite this

Filanovsky, I. M., Oliveira, L. B., Tchamov, N. T., & Ivanov, V. V. (2017). A simple LDO with adaptable bias for internet of things applications. In IEEE International Symposium on Circuits and Systems: From Dreams to Innovation, ISCAS 2017 - Conference Proceedings [8050540] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ISCAS.2017.8050540
Filanovsky, I. M. ; Oliveira, L. B. ; Tchamov, N. T. ; Ivanov, V. V. / A simple LDO with adaptable bias for internet of things applications. IEEE International Symposium on Circuits and Systems: From Dreams to Innovation, ISCAS 2017 - Conference Proceedings. Institute of Electrical and Electronics Engineers Inc., 2017.
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Filanovsky, IM, Oliveira, LB, Tchamov, NT & Ivanov, VV 2017, A simple LDO with adaptable bias for internet of things applications. in IEEE International Symposium on Circuits and Systems: From Dreams to Innovation, ISCAS 2017 - Conference Proceedings., 8050540, Institute of Electrical and Electronics Engineers Inc., 50th IEEE International Symposium on Circuits and Systems, ISCAS 2017, Baltimore, United States, 28/05/17. https://doi.org/10.1109/ISCAS.2017.8050540

A simple LDO with adaptable bias for internet of things applications. / Filanovsky, I. M.; Oliveira, L. B.; Tchamov, N. T.; Ivanov, V. V.

IEEE International Symposium on Circuits and Systems: From Dreams to Innovation, ISCAS 2017 - Conference Proceedings. Institute of Electrical and Electronics Engineers Inc., 2017. 8050540.

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

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N2 - A new transistor model is used for design of two LDO regulators using a differential stage loaded by a current amplifier and the voltage feedback. The first LDO has a constant bias current, the second LDO has an additional adaptable bias circuit controlled by the load current. The LDOs are analyzed and compared. When the load is absent, the transistors in both circuits are operating in weak inversion; when the load is increasing the pass transistors in both circuits are moving to strong inversion. It is shown that in these LDOs the output voltage may be higher than the input reference voltage at very small load currents, and the circuits start "to follow" the input voltage only being loaded with a load current depending on the bias and LDO loop gain. The circuits were designed for 130 nm CMOS technology and their operation was verified using CADENCE simulation tool.

AB - A new transistor model is used for design of two LDO regulators using a differential stage loaded by a current amplifier and the voltage feedback. The first LDO has a constant bias current, the second LDO has an additional adaptable bias circuit controlled by the load current. The LDOs are analyzed and compared. When the load is absent, the transistors in both circuits are operating in weak inversion; when the load is increasing the pass transistors in both circuits are moving to strong inversion. It is shown that in these LDOs the output voltage may be higher than the input reference voltage at very small load currents, and the circuits start "to follow" the input voltage only being loaded with a load current depending on the bias and LDO loop gain. The circuits were designed for 130 nm CMOS technology and their operation was verified using CADENCE simulation tool.

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Filanovsky IM, Oliveira LB, Tchamov NT, Ivanov VV. A simple LDO with adaptable bias for internet of things applications. In IEEE International Symposium on Circuits and Systems: From Dreams to Innovation, ISCAS 2017 - Conference Proceedings. Institute of Electrical and Electronics Engineers Inc. 2017. 8050540 https://doi.org/10.1109/ISCAS.2017.8050540