Summary

Jason Sachs explains how to analyze a three-op-amp instrumentation amplifier, focusing on practical methods to predict gain, CMRR, noise, and error sources. The article teaches how to choose op-amps, design resistor networks, and verify performance on the bench and at the ADC interface.

Key Takeaways

• Calculate the overall gain and common-mode rejection (CMRR) for the three-op-amp topology and relate them to resistor tolerances.
• Evaluate op-amp specifications (input offset, bias current, noise, bandwidth) to meet accuracy and bandwidth requirements.
• Design resistor networks and trimming strategies to minimize offset, drift, and input bias-induced errors.
• Minimize noise and interference through PCB layout, grounding, decoupling, and power-supply filtering techniques.
• Implement calibration and ADC interfacing practices to preserve dynamic range and measurement accuracy.

Who Should Read This

Embedded hardware and firmware engineers with some analog background who design, debug, or integrate low-noise sensor front-ends and need practical analysis and verification techniques.

TimelessIntermediate

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