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Op Amp Precision Design: PCB Layout Techniques

AN1258. Op Amp Precision Design: PCB Layout Techniques Author: Kumen Blake THERMOCOUPLE JUNCTION. Microchip Technology Inc. BEHAVIOR. Most electrical engineers are aware that INTRODUCTION thermocouples are a common temperature sensor [4]. What is not so commonly known is that every PCB. This application note covers Printed Circuit Board design includes many unintended thermocouple (PCB) effects encountered in high (DC) Precision op junctions that modify the signal voltages. This section amp circuits. It provides Techniques for improving the covers the physics behind this effect and gives performance, giving more flexibility in solving a given practical illustrations. design problem. It demonstrates one important factor necessary to convert a good schematic into a working Seebeck Effect Precision design. When two dissimilar conductors (or semi-conductors). This material is for engineers that design slow Precision are joined together, and their junction is heated, a circuits, including those with op amps.

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