Effect of transformer symmetry on intrabody communication channel measurements using grounded instruments. (1st January 2016)

• Record Type: Journal Article
• Authors: Vasić, Željka Lučev; Krois, Igor; Cifrek, Mario
• Is Part Of: Automatika. Volume 57:Number 1(2016)
• Page Start: 15
• Page End: 26
• Publication Date: 2016-01-01
• Subjects: Capacitive coupling -- Electrode configuration -- arrangement -- Intrabody communication (IBC) -- Transformer symmetry; Kapacitivna sprega -- konfiguracija i položaj elektroda -- prijenos signala ljudskim tijelom -- simetrija transformatora; Automatic control -- Periodicals; 629.805
• DOI: 10.7305/automatika.2016.01.1583
• Languages: English
• ISSNs: 0005-1144

Abstract

Abstract : Transformers with one winding terminal symmetrical with respect to ground (capacitances between their terminals and ground are the same) are referred to as balun transformers, and are often used for decoupling in the measurements of the intrabody communication (IBC) system transmission characteristics. We measured IBC system amplitude and phase transmission characteristics using three types of galvanic decouplers: non-symmetric RF transformers, balun transformers with center tap grounded and balun transformers with center tap floating. Four possible electrode configurations (AA, AB, BA, and BB) and four electrode arrangements (GSGS, GSSG, SGGS, and SGSG), result in a total of 16 measurement scenarios for each of three measurement setups. We showed that the change in the measured amplitude for different signal and ground electrode arrangements while measuring with non-symmetric transformers is influenced by the transformer symmetry to the ground, and not the capacitive intrabody communication transmission characteristics. The change of the amplitude in case symmetric balun transformers are used is negligible for practical purposes.