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Common mode electronic noise in differential circuits Serrano Finetti, Roberto Ernesto Casas Piedrafita, Óscar Pallàs-Areny, Ramon Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica Universitat Politècnica de Catalunya. GRUP ISI - Grup d'Instrumentació, Sensors i Interfícies Àrees temàtiques de la UPC::Enginyeria electrònica Amplifiers (Electronics) Operational amplifiers Electronic noise Differential circuits Instrumentation amplifiers Electronic noise Cross-correlation Noise model Common-mode rejection ratio Soroll Electronic Amplificadors (Electrònica) Differential circuits are assumed to reject common-mode noise yet no parameter is available to describethat rejection as the Common Mode Rejection Ratio (CMRR) applies only to deterministic signals, not torandom noise. We propose a model and a method to analyze the contribution of the input common-modeelectronic noise to the output voltage noise of differential circuits. The analysis shows that the sameparameter-matching conditions that improve the CMRR determine common-mode noise rejection butCMRR is more sensitive to mismatching. For example, a low-frequency CMRR as low as 8 dB implies thatmore than 82% of common-mode noise is rejected. Thus, often only differential-mode noise is relevant.However, if the equivalent input current noise sources predominate over equivalent input voltage noisesources, cross-correlation between them partially yields common-mode noise that will also be rejected.We also propose a simple test that yields an estimate of that correlation. Peer Reviewed Postprint (published version) 2019-07-01 Article Serrano, R.; Casas, J.O.; Pallàs-Areny, R. Common mode electronic noise in differential circuits. "Measurement", 1 Juliol 2019, vol. 140, p. 207-214. 0263-2241 https://hdl.handle.net/2117/174258 10.1016/j.measurement.2019.04.028 eng https://www.sciencedirect.com/science/article/pii/S0263224119303306 http://creativecommons.org/licenses/by-nc-nd/3.0/es/ Open Access Attribution-NonCommercial-NoDerivs 3.0 Spain 8 p. application/pdf