Constant gm rail-to-rail CMOS OpAmp with only one differential pair and switched level shifters

M. R. Valero; Antonio Lopez-Martin; Alejandro Roman-Loera; Jaime Ramirez-Angulo; Ramon G. Carvajal

doi:10.1109/ISCAS.2015.7169183

Constant g_m rail-to-rail CMOS OpAmp with only one differential pair and switched level shifters

M. R. Valero, Antonio Lopez-Martin, Alejandro Roman-Loera, Jaime Ramirez-Angulo, Ramon G. Carvajal

Research output: Chapter in Book/Report/Conference proceeding › Conference Contribution (Conference Proceeding)

2 Citations (Scopus)

Abstract

This paper introduces a simple approach for the implementation of rail-to-rail operational amplifiers (OpAmps) with constant g_m using only one differential input pair. It is based on the utilization of switched voltage followers that introduce a DC level shift when the OpAmp's common mode input voltage is lower than the headroom of the input differential pair (DP). Additional circuitry is introduced in order to make the DP tail current insensitive to common mode input voltage variations. This improves CMRR and PSRR and reduces g_m variations. The additional circuitry increases power dissipation by less than 20%. Simulation results are presented that verify rail-to-rail operation with ±1.65 supply voltages in 0.5μm CMOS technology.

Original language	English
Title of host publication	2015 IEEE International Symposium on Circuits and Systems, ISCAS 2015
Publisher	Institute of Electrical and Electronics Engineers (IEEE)
Pages	2461-2464
Number of pages	4
ISBN (Electronic)	9781479983919
DOIs	https://doi.org/10.1109/ISCAS.2015.7169183
Publication status	Published - 27 Jul 2015
Event	IEEE International Symposium on Circuits and Systems, ISCAS 2015 - Lisbon, Portugal Duration: 24 May 2015 → 27 May 2015

Publication series

Name	Proceedings - IEEE International Symposium on Circuits and Systems
Volume	2015-July
ISSN (Print)	0271-4310

Conference

Conference	IEEE International Symposium on Circuits and Systems, ISCAS 2015
Country/Territory	Portugal
City	Lisbon
Period	24/05/15 → 27/05/15

Keywords

Amplifiers
CMOS Analog integrated circuits
low-voltage low power design
rail-to-rail amplifiers

Access to Document

10.1109/ISCAS.2015.7169183

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Cite this

Valero, M. R., Lopez-Martin, A., Roman-Loera, A., Ramirez-Angulo, J., & Carvajal, R. G. (2015). Constant g_m rail-to-rail CMOS OpAmp with only one differential pair and switched level shifters. In 2015 IEEE International Symposium on Circuits and Systems, ISCAS 2015 (pp. 2461-2464). Article 7169183 (Proceedings - IEEE International Symposium on Circuits and Systems; Vol. 2015-July). Institute of Electrical and Electronics Engineers (IEEE). https://doi.org/10.1109/ISCAS.2015.7169183

Valero, M. R. ; Lopez-Martin, Antonio ; Roman-Loera, Alejandro et al. / Constant g_m rail-to-rail CMOS OpAmp with only one differential pair and switched level shifters. 2015 IEEE International Symposium on Circuits and Systems, ISCAS 2015. Institute of Electrical and Electronics Engineers (IEEE), 2015. pp. 2461-2464 (Proceedings - IEEE International Symposium on Circuits and Systems).

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title = "Constant gm rail-to-rail CMOS OpAmp with only one differential pair and switched level shifters",

abstract = "This paper introduces a simple approach for the implementation of rail-to-rail operational amplifiers (OpAmps) with constant gm using only one differential input pair. It is based on the utilization of switched voltage followers that introduce a DC level shift when the OpAmp's common mode input voltage is lower than the headroom of the input differential pair (DP). Additional circuitry is introduced in order to make the DP tail current insensitive to common mode input voltage variations. This improves CMRR and PSRR and reduces gm variations. The additional circuitry increases power dissipation by less than 20%. Simulation results are presented that verify rail-to-rail operation with ±1.65 supply voltages in 0.5μm CMOS technology.",

keywords = "Amplifiers, CMOS Analog integrated circuits, low-voltage low power design, rail-to-rail amplifiers",

author = "Valero, {M. R.} and Antonio Lopez-Martin and Alejandro Roman-Loera and Jaime Ramirez-Angulo and Carvajal, {Ramon G.}",

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Valero, MR, Lopez-Martin, A, Roman-Loera, A, Ramirez-Angulo, J & Carvajal, RG 2015, Constant g_m rail-to-rail CMOS OpAmp with only one differential pair and switched level shifters. in 2015 IEEE International Symposium on Circuits and Systems, ISCAS 2015., 7169183, Proceedings - IEEE International Symposium on Circuits and Systems, vol. 2015-July, Institute of Electrical and Electronics Engineers (IEEE), pp. 2461-2464, IEEE International Symposium on Circuits and Systems, ISCAS 2015, Lisbon, Portugal, 24/05/15. https://doi.org/10.1109/ISCAS.2015.7169183

Constant g_m rail-to-rail CMOS OpAmp with only one differential pair and switched level shifters. / Valero, M. R.; Lopez-Martin, Antonio; Roman-Loera, Alejandro et al.
2015 IEEE International Symposium on Circuits and Systems, ISCAS 2015. Institute of Electrical and Electronics Engineers (IEEE), 2015. p. 2461-2464 7169183 (Proceedings - IEEE International Symposium on Circuits and Systems; Vol. 2015-July).

Research output: Chapter in Book/Report/Conference proceeding › Conference Contribution (Conference Proceeding)

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N2 - This paper introduces a simple approach for the implementation of rail-to-rail operational amplifiers (OpAmps) with constant gm using only one differential input pair. It is based on the utilization of switched voltage followers that introduce a DC level shift when the OpAmp's common mode input voltage is lower than the headroom of the input differential pair (DP). Additional circuitry is introduced in order to make the DP tail current insensitive to common mode input voltage variations. This improves CMRR and PSRR and reduces gm variations. The additional circuitry increases power dissipation by less than 20%. Simulation results are presented that verify rail-to-rail operation with ±1.65 supply voltages in 0.5μm CMOS technology.

AB - This paper introduces a simple approach for the implementation of rail-to-rail operational amplifiers (OpAmps) with constant gm using only one differential input pair. It is based on the utilization of switched voltage followers that introduce a DC level shift when the OpAmp's common mode input voltage is lower than the headroom of the input differential pair (DP). Additional circuitry is introduced in order to make the DP tail current insensitive to common mode input voltage variations. This improves CMRR and PSRR and reduces gm variations. The additional circuitry increases power dissipation by less than 20%. Simulation results are presented that verify rail-to-rail operation with ±1.65 supply voltages in 0.5μm CMOS technology.

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Valero MR, Lopez-Martin A, Roman-Loera A, Ramirez-Angulo J, Carvajal RG. Constant g_m rail-to-rail CMOS OpAmp with only one differential pair and switched level shifters. In 2015 IEEE International Symposium on Circuits and Systems, ISCAS 2015. Institute of Electrical and Electronics Engineers (IEEE). 2015. p. 2461-2464. 7169183. (Proceedings - IEEE International Symposium on Circuits and Systems). doi: 10.1109/ISCAS.2015.7169183