doi:10.3390/s18051382engMárquez, A.Pérez-Bailón, J.Calvo, B.Medrano, N.Martínez, P.A.A CMOS self-contained quadrature signal generator for soc impedance spectroscopyART-2018-106476This paper presents a low-power fully integrated quadrature signal generator for system-on-chip (SoC) impedance spectroscopy applications. It has been designed in a 0.18 µm-1.8 V CMOS technology as a self-contained oscillator, without the need for an external reference clock. The frequency can be digitally tuned from 10 to 345 kHz with 12-bit accuracy and a relative mean error below 1.7%, thus supporting a wide range of impedance sensing applications. The proposal is experimentally validated in two impedance spectrometry examples, achieving good magnitude and phase recovery results compared to the results obtained using a commercial LCR-meter. Besides the wide frequency tuning range, the proposed programmable oscillator features a total power consumption lower than 0.77 mW and an active area of 0.129 mm2, thus constituting a highly suitable choice as stimulation module for instrument-on-a-chip devices.2018http://zaguan.unizar.es/record/7093810.3390/s18051382http://zaguan.unizar.es/record/70938oai:zaguan.unizar.es:70938info:eu-repo/grantAgreement/ES/MINECO-FEDER/TEC2015-65750-RSensors (Switzerland) 18, 5 (2018), 1382 [17 pp]byhttp://creativecommons.org/licenses/by/3.0/es/info:eu-repo/semantics/openAccess