Dynamic range of low-voltage cascode current mirrors

Erik Bruun; Peter Jivan Shah

doi:10.1109/ISCAS.1995.520391

Dynamic range of low-voltage cascode current mirrors

Erik Bruun
, Peter Jivan Shah

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

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Abstract

Low-voltage cascode current mirrors are reviewed with respect to the design limitations imposed if all transistors in the mirror are required to operate in the saturation region. It is found that both a lower limit and an upper limit exist for the cascode transistor bias voltage. Further, the use of a signal dependent cascode bias voltage is discussed and a self-biased cascode configuration is presented. This configuration makes it possible to use a higher effective gate-source voltage for the mirror transistors, hence reducing the effect of threshold voltage mismatch on the current mirror gain. The proposed configuration has the advantage of simplicity combined with a complete elimination of the need for fixed bias voltages or bias currents in the current mirror. A disadvantage is that it requires a higher input voltage to the current mirror

Original language	English
Title of host publication	Proceedings of the IEEE International Symposium on Circuits and Systems
Volume	Volume 2
Publisher	IEEE
Publication date	1995
Pages	1328-1331
ISBN (Print)	07-80-32570-2
DOIs	https://doi.org/10.1109/ISCAS.1995.520391
Publication status	Published - 1995
Event	1995 IEEE International Symposium on Circuits and Systems - Seattle, WA, United States Duration: 30 Apr 1995 → 3 May 1995 http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=3941

Conference

Conference	1995 IEEE International Symposium on Circuits and Systems
Country/Territory	United States
City	Seattle, WA
Period	30/04/1995 → 03/05/1995
Internet address	http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=3941

Bibliographical note

Copyright: 1995 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE

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title = "Dynamic range of low-voltage cascode current mirrors",

abstract = "Low-voltage cascode current mirrors are reviewed with respect to the design limitations imposed if all transistors in the mirror are required to operate in the saturation region. It is found that both a lower limit and an upper limit exist for the cascode transistor bias voltage. Further, the use of a signal dependent cascode bias voltage is discussed and a self-biased cascode configuration is presented. This configuration makes it possible to use a higher effective gate-source voltage for the mirror transistors, hence reducing the effect of threshold voltage mismatch on the current mirror gain. The proposed configuration has the advantage of simplicity combined with a complete elimination of the need for fixed bias voltages or bias currents in the current mirror. A disadvantage is that it requires a higher input voltage to the current mirror",

author = "Erik Bruun and Shah, \{Peter Jivan\}",

note = "Copyright: 1995 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE; 1995 IEEE International Symposium on Circuits and Systems, ISCAS '95 ; Conference date: 30-04-1995 Through 03-05-1995",

year = "1995",

doi = "10.1109/ISCAS.1995.520391",

language = "English",

isbn = "07-80-32570-2",

volume = "Volume 2",

pages = "1328--1331",

booktitle = "Proceedings of the IEEE International Symposium on Circuits and Systems",

publisher = "IEEE",

address = "United States",

url = "http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=3941",

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TY - GEN

T1 - Dynamic range of low-voltage cascode current mirrors

AU - Bruun, Erik

AU - Shah, Peter Jivan

N1 - Copyright: 1995 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE

PY - 1995

Y1 - 1995

N2 - Low-voltage cascode current mirrors are reviewed with respect to the design limitations imposed if all transistors in the mirror are required to operate in the saturation region. It is found that both a lower limit and an upper limit exist for the cascode transistor bias voltage. Further, the use of a signal dependent cascode bias voltage is discussed and a self-biased cascode configuration is presented. This configuration makes it possible to use a higher effective gate-source voltage for the mirror transistors, hence reducing the effect of threshold voltage mismatch on the current mirror gain. The proposed configuration has the advantage of simplicity combined with a complete elimination of the need for fixed bias voltages or bias currents in the current mirror. A disadvantage is that it requires a higher input voltage to the current mirror

AB - Low-voltage cascode current mirrors are reviewed with respect to the design limitations imposed if all transistors in the mirror are required to operate in the saturation region. It is found that both a lower limit and an upper limit exist for the cascode transistor bias voltage. Further, the use of a signal dependent cascode bias voltage is discussed and a self-biased cascode configuration is presented. This configuration makes it possible to use a higher effective gate-source voltage for the mirror transistors, hence reducing the effect of threshold voltage mismatch on the current mirror gain. The proposed configuration has the advantage of simplicity combined with a complete elimination of the need for fixed bias voltages or bias currents in the current mirror. A disadvantage is that it requires a higher input voltage to the current mirror

U2 - 10.1109/ISCAS.1995.520391

DO - 10.1109/ISCAS.1995.520391

M3 - Article in proceedings

SN - 07-80-32570-2

VL - Volume 2

SP - 1328

EP - 1331

BT - Proceedings of the IEEE International Symposium on Circuits and Systems

PB - IEEE

T2 - 1995 IEEE International Symposium on Circuits and Systems

Y2 - 30 April 1995 through 3 May 1995

ER -

Dynamic range of low-voltage cascode current mirrors

Abstract

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