7. Op-Amps in Instrumentation Circuits
Instrumentation circuits are essential for amplifying and processing signals from sensors, with operational amplifiers (Op-Amps) playing a crucial role due to their high gain and precision. The chapter covers various aspects of instrumentation amplifiers, precision rectifiers, low-noise amplifiers, and differential amplifiers, outlining their designs, characteristics, and applications in measurement systems.
Sections
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What we have learnt
- Instrumentation amplifiers are used for precise amplification of low-level differential signals.
- Precision rectifiers and peak detectors are crucial for accurate signal rectification and peak value detection.
- Low-noise amplifiers amplify weak signals while minimizing additional noise.
Key Concepts
- -- Instrumentation Amplifier
- A differential amplifier designed for low-level signal amplification, offering high input impedance and excellent common-mode rejection ratio.
- -- Precision Rectifier
- An Op-Amp-based circuit that rectifies an AC signal accurately without traditional diodes, important for low signal levels.
- -- LowNoise Amplifier (LNA)
- Specialized Op-Amp circuits designed to amplify very weak signals while introducing minimal additional noise.
- -- Differential Amplifier
- Amplifies the difference between two input signals while rejecting common-mode noise, enhancing signal quality in instrumentation.
Additional Learning Materials
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