TY - GEN
T1 - OpAmp design for lock-in amplifiers in portable sensing systems
AU - Valero, M. R.
AU - Celma-Pueyo, Santiago
AU - Medrano, N.
AU - Calvo, B.
PY - 2013/1/1
Y1 - 2013/1/1
N2 - This paper presents a 1.2 V low-power rail-to-rail class AB operational amplifier (OpAmp) suitable for integrated lock-in amplifiers. The proposed OpAmp has been designed in a standard 0.18 μm CMOS technology. For a 1.2 V single supply and 81 μW power consumption, simulations shows a 86 dB open loop gain, 56 phase margin, 17 MHz unity gain frequency with 1 pF load and 97 dB CMRR. Adaptive biasing provides 33 V/μs slew-rate for a 1 pF capacitive load. A compact and reliable lock-in amplifier (LIA) has been designed using the proposed circuit. Post-layout results for noisy signals confirm the capability of the LIA to effectively recover information from signal-to-noise ratios down to -26 dB with errors below 4.2% up to 50 kHz and a power consumption of only 675 μW.
AB - This paper presents a 1.2 V low-power rail-to-rail class AB operational amplifier (OpAmp) suitable for integrated lock-in amplifiers. The proposed OpAmp has been designed in a standard 0.18 μm CMOS technology. For a 1.2 V single supply and 81 μW power consumption, simulations shows a 86 dB open loop gain, 56 phase margin, 17 MHz unity gain frequency with 1 pF load and 97 dB CMRR. Adaptive biasing provides 33 V/μs slew-rate for a 1 pF capacitive load. A compact and reliable lock-in amplifier (LIA) has been designed using the proposed circuit. Post-layout results for noisy signals confirm the capability of the LIA to effectively recover information from signal-to-noise ratios down to -26 dB with errors below 4.2% up to 50 kHz and a power consumption of only 675 μW.
UR - http://www.scopus.com/inward/record.url?scp=84892657841&partnerID=8YFLogxK
U2 - 10.1109/ecctd.2013.6662283
DO - 10.1109/ecctd.2013.6662283
M3 - Conference Contribution (Conference Proceeding)
AN - SCOPUS:84892657841
SN - 9783000437854
T3 - 2013 European Conference on Circuit Theory and Design, ECCTD 2013 - Proceedings
BT - 2013 European Conference on Circuit Theory and Design, ECCTD 2013 - Proceedings
PB - IEEE Computer Society
T2 - 2013 European Conference on Circuit Theory and Design, ECCTD 2013
Y2 - 8 September 2013 through 12 September 2013
ER -