Title: An analogue building block for signal conditioning instrumentation circuits

Authors: Enrique Mario Spinelli; Marcelo Alejandro Haberman

Addresses: Industrial Electronics, Control and Instrumentation Laboratory (LEICI), Faculty of Engineering, National University of La Plata, CC 91 – (1900) La Plata, Argentina ' Industrial Electronics, Control and Instrumentation Laboratory (LEICI), Faculty of Engineering, National University of La Plata, CC 91 – (1900) La Plata, Argentina

Abstract: The design of analogue signal conditioning circuits for instrumentation applications often requires designing a specific circuit for each case. For board-level design solutions, these circuits are generally implemented by using operational amplifiers (OA) and instrumentation amplifiers (IA). An analogue building block (ABB) is proposed, which can be implemented with three standard OAs. Using different connection schemes and just adding a few resistors, it allows implementing several analogue circuits such as common-mode conditioners, single-ended to differential and differential to single-ended converters, voltage and current amplifiers, current to voltage and voltage to current converters, among others. The proposed ABB is analysed and applied to several typical analogue conditioning problems. The design equations and experimental results for these circuits are presented.

Keywords: analogue building blocks; ABBs; common-mode processing; signal conditioning; differential-mode processing; board level design.

DOI: 10.1504/IJIT.2021.123097

International Journal of Instrumentation Technology, 2021 Vol.3 No.1, pp.57 - 74

Received: 02 Jun 2021
Accepted: 20 Jan 2022
Published online: 26 May 2022 *

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