Amplifiers & Op-Amps
Amplifiers and op-amps are core components that condition, filter and boost weak analog signals. They form the analog heart of measurement and signal processing.
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General-purpose op-amps, instrumentation amplifiers, comparators and power/audio amplifiers are the main types. Supply voltage, bandwidth, offset voltage and noise matter when choosing one. Sensor interfacing, active filters, signal comparison and audio are the most common applications.
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Frequently asked questions
What does an op-amp do?+
An op-amp amplifies the small voltage difference between its two inputs with very high gain. With feedback resistors it can build many analog functions like amplifiers, filters, summers and comparators.
What is the difference between an op-amp and a comparator?+
An op-amp is optimized for linear operation (with feedback); a comparator is designed to compare two voltages and give a digital high/low output and is faster.
What is an instrumentation amplifier?+
An instrumentation amplifier amplifies very small differential signals (e.g. a sensor bridge) with high accuracy and high input impedance in noisy environments. It is preferred for precision measurement.