doi:10.1109/TCSII.2021.3107613engPerez-Bailon, J.Sanz-Pascual, M. T.Calvo, B.Medrano, N.Wide-band compact 1.8 V-0.18 µm CMOS analog front-end for impedance spectroscopyART-2022-127327In this letter, a fully integrated configurable front-end for Impedance Spectroscopy (IS) is presented. The circuit includes fully differential in-phase and quadrature channels, using a transconductor (TC)-transimpedance (TI) approach. The input TC, shared for both channels, is based on a programmable degenerated differential pair to attain low-noise programmable-gain, while identical TII/Q with embedded synchronous rectification provide both I, Q outputs, filtered through fc adjustable Gm-C integrators. It exhibits a programmable gain ranging from 0 dB to 40 dB with 87 MHz bandwidth, amplitude and phase recovery errors below 1.9% and 2.5∘ respectively and an input referred noise floor of 16.7 nV/Hz. The result is a high-performance very compact topology with a total power consumption of 292 μW at a 1.8 V power supply, thus constituting an appropriate solution for full on chip multichannel IS systems.2022http://zaguan.unizar.es/record/12102410.1109/TCSII.2021.3107613http://zaguan.unizar.es/record/121024oai:zaguan.unizar.es:121024info:eu-repo/grantAgreement/ES/MCIU/PID2019-106570RB-I00-AEI-10.13039-501100011033IEEE Transactions on Circuits and Systems II: Express Briefs 69, 3 (2022), 764-768All rights reservedhttp://www.europeana.eu/rights/rr-f/info:eu-repo/semantics/openAccess