An analogue building block for signal conditioning instrumentation circuits

摘要

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.