Stability Improvements in a Rail-to-Rail Input/Output, Constant Gm Operational Amplifier, at 0.4 V Operation, Using the Low-Voltage DTMOS Technique

Joana Correia, Nuno Mancelos, João Goes

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

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Abstract

The use of the dynamic threshold MOS (DTMOS) technique is evaluated in a two-stage rail-to-rail Input/Output, constant G m amplifier. The proper choice of specific transistors in which the technique should be used is presented, as well as the resulting improvements, mainly regarding stability of the circuit at low voltage operation. The DTMOS technique is used in the NMOS transistors of the folded-cascode input stage, allowing the circuit to be stable at V DD = 0.4 V, with equivalent gain and gain-and-bandwidth product (GBW) values achieved with the same V DD value, for the initial circuit operating at 0.8 V. The implemented changes allow the circuit to be stable at low voltage operations without requiring any increase in the cascoded-Miller compensation capacitors, saving circuit area and, consequently, cost.

Original languageEnglish
Title of host publicationTechnological Innovation for Collective Awareness Systems - 5th IFIP WG 5.5/SOCOLNET Doctoral Conference on Computing, Electrical and Industrial Systems, DoCEIS2014, Proceedings
PublisherSpringer New York LLC
Pages585-591
Number of pages7
ISBN (Print)9783642547331
DOIs
Publication statusPublished - 2014
Event5th IFIP WG 5.5/SOCOLNET Doctoral Conference on Computing, Electrical and Industrial Systems, DoCEIS 2014 - Costa de Caparica, Portugal
Duration: 7 Apr 20149 Apr 2014

Publication series

NameIFIP Advances in Information and Communication Technology
Volume423
ISSN (Print)1868-4238

Conference

Conference5th IFIP WG 5.5/SOCOLNET Doctoral Conference on Computing, Electrical and Industrial Systems, DoCEIS 2014
CountryPortugal
CityCosta de Caparica
Period7/04/149/04/14

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Keywords

  • Low supply voltage OPAMP
  • Low-voltage DTMOS technique
  • Low-voltage OPAMP stability issues

Cite this

Correia, J., Mancelos, N., & Goes, J. (2014). Stability Improvements in a Rail-to-Rail Input/Output, Constant Gm Operational Amplifier, at 0.4 V Operation, Using the Low-Voltage DTMOS Technique. In Technological Innovation for Collective Awareness Systems - 5th IFIP WG 5.5/SOCOLNET Doctoral Conference on Computing, Electrical and Industrial Systems, DoCEIS2014, Proceedings (pp. 585-591). (IFIP Advances in Information and Communication Technology; Vol. 423). Springer New York LLC. https://doi.org/10.1007/978-3-642-54734-8_65
Correia, Joana ; Mancelos, Nuno ; Goes, João. / Stability Improvements in a Rail-to-Rail Input/Output, Constant Gm Operational Amplifier, at 0.4 V Operation, Using the Low-Voltage DTMOS Technique. Technological Innovation for Collective Awareness Systems - 5th IFIP WG 5.5/SOCOLNET Doctoral Conference on Computing, Electrical and Industrial Systems, DoCEIS2014, Proceedings. Springer New York LLC, 2014. pp. 585-591 (IFIP Advances in Information and Communication Technology).
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abstract = "The use of the dynamic threshold MOS (DTMOS) technique is evaluated in a two-stage rail-to-rail Input/Output, constant G m amplifier. The proper choice of specific transistors in which the technique should be used is presented, as well as the resulting improvements, mainly regarding stability of the circuit at low voltage operation. The DTMOS technique is used in the NMOS transistors of the folded-cascode input stage, allowing the circuit to be stable at V DD = 0.4 V, with equivalent gain and gain-and-bandwidth product (GBW) values achieved with the same V DD value, for the initial circuit operating at 0.8 V. The implemented changes allow the circuit to be stable at low voltage operations without requiring any increase in the cascoded-Miller compensation capacitors, saving circuit area and, consequently, cost.",
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Correia, J, Mancelos, N & Goes, J 2014, Stability Improvements in a Rail-to-Rail Input/Output, Constant Gm Operational Amplifier, at 0.4 V Operation, Using the Low-Voltage DTMOS Technique. in Technological Innovation for Collective Awareness Systems - 5th IFIP WG 5.5/SOCOLNET Doctoral Conference on Computing, Electrical and Industrial Systems, DoCEIS2014, Proceedings. IFIP Advances in Information and Communication Technology, vol. 423, Springer New York LLC, pp. 585-591, 5th IFIP WG 5.5/SOCOLNET Doctoral Conference on Computing, Electrical and Industrial Systems, DoCEIS 2014, Costa de Caparica, Portugal, 7/04/14. https://doi.org/10.1007/978-3-642-54734-8_65

Stability Improvements in a Rail-to-Rail Input/Output, Constant Gm Operational Amplifier, at 0.4 V Operation, Using the Low-Voltage DTMOS Technique. / Correia, Joana; Mancelos, Nuno; Goes, João.

Technological Innovation for Collective Awareness Systems - 5th IFIP WG 5.5/SOCOLNET Doctoral Conference on Computing, Electrical and Industrial Systems, DoCEIS2014, Proceedings. Springer New York LLC, 2014. p. 585-591 (IFIP Advances in Information and Communication Technology; Vol. 423).

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

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Correia J, Mancelos N, Goes J. Stability Improvements in a Rail-to-Rail Input/Output, Constant Gm Operational Amplifier, at 0.4 V Operation, Using the Low-Voltage DTMOS Technique. In Technological Innovation for Collective Awareness Systems - 5th IFIP WG 5.5/SOCOLNET Doctoral Conference on Computing, Electrical and Industrial Systems, DoCEIS2014, Proceedings. Springer New York LLC. 2014. p. 585-591. (IFIP Advances in Information and Communication Technology). https://doi.org/10.1007/978-3-642-54734-8_65