Simple linearising front‐end‐circuit for giant magneto‐resistance sensors. Issue 2 (1st January 2018)

• Record Type: Journal Article
• Authors: Sen, T.; Anoop, C.S.; Sen, S.
• Is Part Of: Electronics letters. Volume 54:Issue 2(2018)
• Page Start: 81
• Page End: 83
• Publication Date: 2018-01-01
• Subjects: giant magnetoresistance -- magnetic sensors -- operational amplifiers -- printed circuits -- circuit feedback; simple linearising front‐end circuit -- giant magneto‐resistance sensors -- GMR sensors -- single opamp -- active GMR element -- feedback loop -- printed‐circuit board; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2017.3860
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract : A simple and efficient linearisation front‐end circuit for giant magneto‐resistance (GMR) sensors are presented. This circuit essentially uses only a single opamp to linearise the (non‐linear) GMR sensor output. A novel methodology that places an active GMR element, present inside the GMR sensor, in the feedback loop of the opamp is employed for linearisation. Initial validation of the front‐end is performed using simulation and emulation studies. Then, the front‐end, fabricated on a printed‐circuit board, is interfaced with a GMR sensor. Experimentation showed output non‐linearity is around 0.6%. The proposed front‐end possess merits, like, low component‐count and minimal error, no requirement of expensive amplifiers or matched resistors for linearisation, fast response, over the existing methods.