2026-04-05T10:43:31Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/1742582026-01-16T06:14:46Zcom_2072_1033col_2072_452950

Common mode electronic noise in differential circuits Serrano Finetti, Roberto Ernesto Casas Piedrafita, Óscar Pallàs-Areny, Ramon 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 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