An ultra low-power low-voltage class AB CMOS fully differential OpAmp

M. R. Valero; S. Celma; N. Medrano; B. Calvo; C. Azcona

doi:10.1109/ISCAS.2012.6271661

An ultra low-power low-voltage class AB CMOS fully differential OpAmp

M. R. Valero, S. Celma, N. Medrano, B. Calvo, C. Azcona

Department of Electronic & Electrical Engineering

University of Zaragoza

Research output: Chapter or section in a book/report/conference proceeding › Chapter in a published conference proceeding

15 Citations (SciVal)

Abstract

This paper presents an ultra low-power class AB operational amplifier (OpAmp) designed in a low-cost 0.18 μm CMOS technology. Rail-to-rail input operation is achieved by using complementary input pairs with adaptive bias to enhance slew-rate. A class AB output stage is employed. For low-voltage low-power operation, the transistors both in the input and the output stage are biased in the sub-threshold region. The simulated DC open loop gain is 51 dB, the unity gain frequency is 40 kHz with a 65° phase margin and the slew-rate is 0.12 V/μs with 10 pF capacitive loads. A common-mode feed-forward circuit (CMFF) increases CMRR, keeping the DC gain almost constant: its relative error remains below 1 % for a (-40°C, +120°C) temperature range. The proposed OpAmp consumes only 1 μW at 0.8 V supply.

Original language	English
Title of host publication	2012 IEEE International Symposium on Circuits and Systems
Place of Publication	U.S.A.
Publisher	IEEE
Pages	1967-1970
Number of pages	4
DOIs	https://doi.org/10.1109/ISCAS.2012.6271661
Publication status	Published - 20 Aug 2012
Event	2012 IEEE International Symposium on Circuits and Systems - ISCAS 2012 - Seoul, Korea (South) Duration: 20 May 2012 → 23 May 2012

Conference

Conference	2012 IEEE International Symposium on Circuits and Systems - ISCAS 2012
City	Seoul, Korea (South)
Period	20/05/12 → 23/05/12

Keywords

CMOS integrated circuits
feedforward
operational amplifiers
CMFF
CMOS technology
common mode feedforward circuit
complementary input pairs
frequency 40 kHz
gain 51 dB
low power low voltage class AB operational amplifier
power 1 muW
rail-to-rail input operation
simulated DC open loop gain
size 0.18 mum
slew rate
subthreshold region
temperature -40 degC to 120 degC
unity gain frequency
voltage 0.8 V
Gain
MOS devices
Operational amplifiers
Rail to rail inputs
Temperature distribution
Transistors

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10.1109/ISCAS.2012.6271661

Cite this

@inproceedings{cf0bd26a611846f2805ab9316afc253e,

title = "An ultra low-power low-voltage class AB CMOS fully differential OpAmp",

abstract = "This paper presents an ultra low-power class AB operational amplifier (OpAmp) designed in a low-cost 0.18 μm CMOS technology. Rail-to-rail input operation is achieved by using complementary input pairs with adaptive bias to enhance slew-rate. A class AB output stage is employed. For low-voltage low-power operation, the transistors both in the input and the output stage are biased in the sub-threshold region. The simulated DC open loop gain is 51 dB, the unity gain frequency is 40 kHz with a 65° phase margin and the slew-rate is 0.12 V/μs with 10 pF capacitive loads. A common-mode feed-forward circuit (CMFF) increases CMRR, keeping the DC gain almost constant: its relative error remains below 1 % for a (-40°C, +120°C) temperature range. The proposed OpAmp consumes only 1 μW at 0.8 V supply.",

keywords = "CMOS integrated circuits, feedforward, operational amplifiers, CMFF, CMOS technology, common mode feedforward circuit, complementary input pairs, frequency 40 kHz, gain 51 dB, low power low voltage class AB operational amplifier, power 1 muW, rail-to-rail input operation, simulated DC open loop gain, size 0.18 mum, slew rate, subthreshold region, temperature -40 degC to 120 degC, unity gain frequency, voltage 0.8 V, Gain, MOS devices, Operational amplifiers, Rail to rail inputs, Temperature distribution, Transistors",

author = "Valero, {M. R.} and S. Celma and N. Medrano and B. Calvo and C. Azcona",

year = "2012",

month = aug,

day = "20",

doi = "10.1109/ISCAS.2012.6271661",

language = "English",

pages = "1967--1970",

booktitle = "2012 IEEE International Symposium on Circuits and Systems",

publisher = "IEEE",

address = "USA United States",

note = "2012 IEEE International Symposium on Circuits and Systems - ISCAS 2012 ; Conference date: 20-05-2012 Through 23-05-2012",

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TY - GEN

T1 - An ultra low-power low-voltage class AB CMOS fully differential OpAmp

AU - Valero, M. R.

AU - Celma, S.

AU - Medrano, N.

AU - Calvo, B.

AU - Azcona, C.

PY - 2012/8/20

Y1 - 2012/8/20

N2 - This paper presents an ultra low-power class AB operational amplifier (OpAmp) designed in a low-cost 0.18 μm CMOS technology. Rail-to-rail input operation is achieved by using complementary input pairs with adaptive bias to enhance slew-rate. A class AB output stage is employed. For low-voltage low-power operation, the transistors both in the input and the output stage are biased in the sub-threshold region. The simulated DC open loop gain is 51 dB, the unity gain frequency is 40 kHz with a 65° phase margin and the slew-rate is 0.12 V/μs with 10 pF capacitive loads. A common-mode feed-forward circuit (CMFF) increases CMRR, keeping the DC gain almost constant: its relative error remains below 1 % for a (-40°C, +120°C) temperature range. The proposed OpAmp consumes only 1 μW at 0.8 V supply.

AB - This paper presents an ultra low-power class AB operational amplifier (OpAmp) designed in a low-cost 0.18 μm CMOS technology. Rail-to-rail input operation is achieved by using complementary input pairs with adaptive bias to enhance slew-rate. A class AB output stage is employed. For low-voltage low-power operation, the transistors both in the input and the output stage are biased in the sub-threshold region. The simulated DC open loop gain is 51 dB, the unity gain frequency is 40 kHz with a 65° phase margin and the slew-rate is 0.12 V/μs with 10 pF capacitive loads. A common-mode feed-forward circuit (CMFF) increases CMRR, keeping the DC gain almost constant: its relative error remains below 1 % for a (-40°C, +120°C) temperature range. The proposed OpAmp consumes only 1 μW at 0.8 V supply.

KW - CMOS integrated circuits

KW - feedforward

KW - operational amplifiers

KW - CMFF

KW - CMOS technology

KW - common mode feedforward circuit

KW - complementary input pairs

KW - frequency 40 kHz

KW - gain 51 dB

KW - low power low voltage class AB operational amplifier

KW - power 1 muW

KW - rail-to-rail input operation

KW - simulated DC open loop gain

KW - size 0.18 mum

KW - slew rate

KW - subthreshold region

KW - temperature -40 degC to 120 degC

KW - unity gain frequency

KW - voltage 0.8 V

KW - Gain

KW - MOS devices

KW - Operational amplifiers

KW - Rail to rail inputs

KW - Temperature distribution

KW - Transistors

U2 - 10.1109/ISCAS.2012.6271661

DO - 10.1109/ISCAS.2012.6271661

M3 - Chapter in a published conference proceeding

SP - 1967

EP - 1970

BT - 2012 IEEE International Symposium on Circuits and Systems

PB - IEEE

CY - U.S.A.

T2 - 2012 IEEE International Symposium on Circuits and Systems - ISCAS 2012

Y2 - 20 May 2012 through 23 May 2012

ER -

An ultra low-power low-voltage class AB CMOS fully differential OpAmp

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Keywords

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