Low cost autonomous lock-in amplifier for resistance/capacitance sensor measurements

Maya, Paulina ; Calvo, Belén (Universidad de Zaragoza) ; Sanz-Pascual, María Teresa ; Osorio, Javier

Resumen: This paper presents the design and experimental characterization of a portable high-precision single-phase lock-in instrument with phase adjustment. The core consists of an analog lock-in amplifier IC prototype, integrated in 0.18 µm CMOS technology with 1.8 V supply, which features programmable gain and operating frequency, resulting in a versatile on-chip solution with power consumption below 834 µW. It incorporates automatic phase alignment of the input and reference signals, performed through both a fixed-90° and a 4-bit digitally programmable phase shifter, specifically designed using commercially available components to operate at 1 kHz frequency. The system is driven by an Arduino YUN board, thus overall conforming a low-cost autonomous signal recovery instrument to determine, in real time, the electrical equivalent of resistive and capacitive sensors with a sensitivity of 16.3 µV/O @ erS < 3 % and 37 kV/F @ erS < 5 %, respectively.

Idioma: Inglés

DOI: 10.3390/electronics8121413

Año: 2019

Publicado en: Electronics 8, 12 (2019), 1413 [18 pp.]
ISSN: 2079-9292

Factor impacto JCR: 2.412 (2019)

Categ. JCR: ENGINEERING, ELECTRICAL & ELECTRONIC rank: 125 / 265 = 0.472 (2019) - Q2 - T2

Factor impacto SCIMAGO: 0.303 - Electrical and Electronic Engineering (Q2) - Control and Systems Engineering (Q3) - Signal Processing (Q3) - Hardware and Architecture (Q3) - Computer Networks and Communications (Q3)

Financiación: info:eu-repo/grantAgreement/ES/MINECO-FEDER/TEC2015-65750-R

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Área Electrónica (Dpto. Ingeniería Electrón.Com.)